The Slave Kings: How Aibak, Iltutmish, Razia and Balban Built the Delhi Sultanate

In 1206 CE, Muhammad of Ghor was assassinated, and his empire in India had no heir. His most capable general, a man who had been bought as a slave, seized Delhi and founded a dynasty. The Mamluk or "Slave" dynasty (1206-1290) was the first of the five dynasties of the Delhi Sultanate, and in eighty-four years it produced a founder, a consolidator, India's only woman Sultan, and one of medieval India's sternest kings.

How the Sultanate was born: Tarain to 1206

The backstory is the Ghurid conquest. Muhammad of Ghor defeated Prithviraj Chauhan at the Second Battle of Tarain in 1192 CE, the battle UPSC treats as the true beginning of Turkish rule in India. The Ghurids did not build an administration; they left trusted slave-generals (the bandagan) in charge of conquered territories.

When Ghor died in 1206, his slave-general Qutb-ud-din Aibak, the governor of Delhi, declared independence. A slave becoming a sovereign was unusual but not absurd in the Turko-Persian world: the Mamluk institution bought, trained and promoted military slaves on merit, creating a fiercely loyal command structure. Aibak's reign (1206-1210) was short, he died in a polo accident, but he began the Qutb Minar complex and the Quwwat-ul-Islam mosque, Delhi's first Indo-Islamic monuments.

Iltutmish: the real founder (1211-1236)

Historians call Iltutmish (Shams-ud-din) the true founder of the Sultanate, because Aibak left a conquest and Iltutmish built a state. Three of his acts are exam gold:

Iltutmish's three institutional pillars

• The iqta system: revenue-yielding land parcels assigned to nobles (muqtis/iqtadars) in lieu of salary, in exchange for maintaining troops, the Sultanate's administrative and military backbone.
• Coinage standardisation: the silver tanka (ancestor of the rupee) and the copper jital became the Sultanate's standard currency.
• Legitimacy: he obtained formal recognition from the Abbasid Caliph, and completed the Qutb Minar (begun c. 1199 by Aibak).

Iltutmish also built Delhi's early water infrastructure, including the Hauz-i-Shamsi tank, and survived the most dangerous external threat of his reign, the Mongol pursuit that reached India's borders. His celebrated decision to nominate his daughter Razia over his sons showed a meritocratic streak his nobles would not forgive.

Razia Sultana: the queen the nobles could not tolerate (1236-1240)

Razia Sultana was the first and only woman to rule the Delhi Sultanate. Iltutmish had judged her the most capable of his children, and she proved him right, she commanded armies in person, appeared unveiled, and wore male attire in court and on campaign.

Her four-year reign ended in a conservative backlash. The powerful corps of Turkish military slaves, the Chahalgani, "the Forty", resented a woman who refused to be their puppet, resented her elevation of non-Turkish officers like Malik Yakut, and combined against her. She was deposed and killed in 1240. After her, a series of weak puppet Sultans (beginning with Bahram Shah) ruled while the Forty tightened their grip, until one of their own destroyed them.

Balban: blood, iron and the shadow of God (1266-1287)

Ghiyasuddin Balban had himself been a member of the Forty before seizing the throne. He understood the nobles' power because he had wielded it, and he crushed it. He abolished the Chahalgani, purged disloyal nobles, and built a spy network of barids (intelligence officers) to watch the administration.

Balban's most famous contribution is ideological: his Theory of Kingship. The Sultan, he declared, was Zil-i-illahi, the Shadow of God on earth. Kingship was divine, distant and awe-inspiring, and he enforced it with Persian court ceremonial designed to humble everyone around him:

Balban's Persian court customs (memorise these)

• Sijda, prostration, bowing fully to the floor before the king.
• Paibos, kissing the monarch's feet.
• Zaminbos, kissing the ground in prostration before the Sultan.
• Naurauz, celebration of the Persian New Year.

Administratively, he created the Diwan-i-Ariz (military department) and followed a "Blood and Iron" policy, ruthless suppression of internal revolts, highway robbers (the Mewatis), and Mongol threats. He also made iqtas transferable and non-hereditary, rotating officers to prevent regional power bases. His true arch at his own tomb in Delhi is considered the first true arch in Indo-Islamic architecture.

The Slave dynasty's balance sheet

In eighty-four years the Mamluks turned a military occupation into a state: a revenue system (iqta), a currency (tanka/jital), a theory of sovereignty (Zil-i-illahi), and an architectural idiom (the Qutb complex) that every later dynasty would inherit. Their weaknesses, succession by assassination, dependence on the bandagan, would be cured by the next dynasty, the Khaljis, who replaced slave-loyalty with something more radical: a standing army paid in cash and fed by state-controlled markets.

Key Terms

• Muhammad of Ghor: Muhammad of Ghor (Mu'izz-ud-din Muhammad Ghori) was the Ghurid ruler whose invasions founded Muslim rule in North India. Defeated by Prithviraj Chauhan at the First Battle of Tarain in 1191, he returned to win decisively at the Second Battle of Tarain in 1192, after which his generals consolidated Ghurid control. Assassinated in 1206, he was succeeded in India by Qutb-ud-din Aibak, founder of the Delhi Sultanate's Mamluk dynasty. The two battles of Tarain (1191 and 1192) are the standard UPSC marker for the transition from Rajput to Sultanate rule.
• Mamluk or "Slave" dynasty (1206-1290: The Mamluk or 'Slave' dynasty was the first dynasty of the Delhi Sultanate, ruling from 1206 to 1290, founded by Qutb-ud-din Aibak, a Turkic slave-general of Muhammad of Ghor. Its notable rulers included Iltutmish (1211-1236), Razia Sultana, and Balban, and it ended when Jalal-ud-din Khalji overthrew Muiz-ud-din Qaiqabad in 1290. For UPSC, it is essential to medieval history questions on the Sultanate's foundation. Iltutmish, who consolidated the Sultanate (1211-1236)
• Ghurid conquest: The Ghurid conquest refers to the late 12th century invasions of north India by Muhammad of Ghor. After losing the First Battle of Tarain in 1191, he won the Second Battle of Tarain in 1192 against Prithviraj Chauhan and defeated Jayachandra of Kannauj at Chandawar in 1194. His general Qutb-ud-din Aibak consolidated these gains and founded the Delhi Sultanate in 1206. For UPSC, it explains the transition from Rajput kingdoms to Sultanate rule. the Second Battle of Tarain in 1192, where Muhammad of Ghor defeated Prithviraj Chauhan
• Prithviraj Chauhan: Prithviraj Chauhan, who ruled circa 1166 to 1192, was the Chahamana ruler of Ajmer and Delhi who defeated Muhammad Ghori at the First Battle of Tarain in 1191 but lost the Second Battle of Tarain in 1192. His defeat opened north India to Turkish rule and the Delhi Sultanate. He is a fixture of prelims medieval history and of questions on Rajput resistance. The Second Battle of Tarain, 1192
• Second Battle of Tarain in 1192 CE: The Second Battle of Tarain (1192) was fought between Muhammad Ghori and the Chauhan ruler Prithviraj Chauhan. Ghori's decisive victory ended major Rajput resistance in the Gangetic plain and paved the way for the establishment of the Delhi Sultanate. It is a landmark date in UPSC medieval history, marking the advent of sustained Turkish rule in India. Muhammad Ghori's victory over Prithviraj Chauhan in 1192
• bandagan: The bandagan are the corps of military slaves who formed the elite core of the Delhi Sultanate's army and administration. Purchased as boys, trained in arms and administration, and personally loyal to the Sultan, they rose to high office and even the throne. For UPSC, they illustrate the Sultanate's Turkish slave-aristocracy and its mechanism of social mobility. Iltutmish and Balban both began as bandagan before becoming Sultans of Delhi, showing how slavery could lead to kingship.
• Qutb-ud-din Aibak: Qutb-ud-din Aibak is the former slave general of Muhammad Ghori who became the first Sultan of Delhi in 1206, founding the Mamluk or Slave dynasty. He commissioned the Qutb Minar and the Quwwat-ul-Islam mosque in Delhi and ruled briefly until his death in a polo accident at Lahore in 1210. For UPSC he is the starting point of the Delhi Sultanate's chronology and Sultanate architecture. Death in a polo accident at Lahore, 1210
• Mamluk institution: The Mamluk institution was the Islamic military system of soldier-slaves, usually Turkic or Caucasian captives purchased, converted to Islam, and trained as an elite military caste. Originating under the Abbasid caliphs in the 9th century, it gave the Mamluks such power that they founded sultanates in Egypt and provided the ruling class of Delhi's first Sultanate dynasty. For UPSC, it explains the rise of slave dynasties in medieval Islamic states. The Mamluk Sultanate of Egypt (1250-1517)
• Qutb Minar complex: The Qutb Minar complex is the archaeological ensemble in Delhi centred on the Qutb Minar, containing the Quwwat-ul-Islam mosque, the Alai Darwaza, the Alai Minar and the famous rust-resistant iron pillar. Built over the thirteenth and fourteenth centuries by successive Sultans, it displays the evolution of early Indo-Islamic architecture and is a UNESCO World Heritage Site. It is a core UPSC topic for Sultanate monuments. Iron pillar of Chandragupta II
• Quwwat-ul-Islam mosque: The Quwwat-ul-Islam mosque is the first congregational mosque built in Delhi, commissioned by Qutb-ud-din Aibak in 1192 within the Qutb complex. Raised on the site of earlier structures with richly carved pillars, it marks the beginning of Indo-Islamic architecture in India, blending Islamic arches and screens with indigenous stonework. It is a foundational UPSC monument for the Slave dynasty's building programme. Commissioned 1192
• Iltutmish (Shams-ud-din: Shams-ud-din Iltutmish is the third and greatest ruler of the Mamluk dynasty of the Delhi Sultanate, reigning from 1211 to 1236. He shifted the capital to Delhi, completed the Qutb Minar, introduced the silver tanka and copper jital, and created the elite Corps of Forty, the Chahalgani. He is the archetypal 'consolidator' Sultan, so his reign anchors GS-1 questions on the early Delhi Sultanate's institutions. Iltutmish's silver tanka, weighing about 175 grains, became the standard coin of the Sultanate.
• iqta system: The iqta system was the Delhi Sultanate's method of assigning land-revenue rights (iqta) to nobles and officers, the iqtadars or muqtis, in lieu of cash salary. The assignee collected the state's share of produce, maintained troops, and remitted the surplus to the treasury. Introduced by Iltutmish, it underpinned the Sultanate's military-fiscal administration and is standard GS-1 medieval history.
• Coinage standardisation: Coinage standardisation is the reform of replacing diverse regional coins with uniform coins of fixed weight and purity. In India the landmark step was Sher Shah Suri's silver rupiya of standard weight, which gave the rupee its name, followed by the British uniform coinage of 1835 across presidencies. Standard coins eased trade, taxation and price comparison. It matters for UPSC history and economy questions on medieval administration, monetary systems and the evolution of the rupee. Sher Shah Suri's silver rupiya, the ancestor of the modern rupee
• silver tanka: The silver tanka was the standard silver coin of the Delhi Sultanate, introduced by Iltutmish in the 13th century alongside the copper jital, creating a bimetallic currency system. It facilitated trade and revenue collection across the Sultanate's territories. For UPSC it is a standard fact in medieval economic history. Iltutmish's tanka issues, bearing Arabic inscriptions, are among the earliest Islamic coins minted in India.
• copper jital: Copper jital was the standard copper coin of the Delhi Sultanate, introduced by Iltutmish (r. 1211-1236) alongside the silver tanka as part of the first uniform currency system in North India. It served as the small-denomination coin of everyday transactions, fixed in weight relative to the tanka. For UPSC it is a classic Prelims fact linking Iltutmish to early medieval Indian coinage and monetary standardisation.
• Legitimacy: Legitimacy is the recognised rightfulness of authority, the belief that a government or institution has the right to rule. Max Weber identified three sources: traditional, charismatic and legal-rational legitimacy. It underpins political stability, obedience and democratic consent. For UPSC, it matters for GS-2 polity questions on democracy, governance and the moral foundations of state power. Max Weber's three types of authority
• Abbasid Caliph: An Abbasid Caliph was a ruler of the Abbasid dynasty, which governed the Islamic world from Baghdad from 750 to 1258 CE, presiding over the Islamic Golden Age of science, philosophy and translation centred on the House of Wisdom. Their decline ended with the Mongol sack of Baghdad. He matters for UPSC in world history and art-and-culture answers, since Abbasid-era scholarship preserved and advanced Greek, Persian and Indian knowledge. Caliph Harun al-Rashid (reigned 786 to 809), whose court at Baghdad symbolised the height of Abbasid cultural and scientific patronage.
• Qutb Minar: Qutb Minar is the 73-metre red sandstone minaret in Delhi begun by Qutb-ud-din Aibak and completed by Iltutmish in the early thirteenth century. Its five tapering storeys, carved inscriptions and projecting balconies make it the supreme early monument of Indo-Islamic architecture in India and a UNESCO World Heritage Site. It is a standard UPSC prelims fact for the Mamluk dynasty and Sultanate art. UNESCO World Heritage inscription, 1993
• Hauz-i-Shamsi: The Hauz-i-Shamsi (also called Hauz-i-Sultani) is a large water reservoir at Mehrauli, Delhi, excavated around 1230 CE by the Delhi Sultanate ruler Iltutmish. Built to supply water to the growing city, it reflects early Sultanate hydraulic engineering. For UPSC, it is a standard medieval-architecture example of water management.
• Mongol: Mongol refers to the nomadic peoples of the Central Asian steppes, united under Genghis Khan in 1206 into an empire that became the largest contiguous land empire in history, stretching from China to Eastern Europe. Their administrative, military and trade innovations reshaped Eurasian history. The term matters for UPSC because Mongol expansion underlies the Delhi Sultanate's frontier policy and the Mughal claim of Timurid descent in GS-1 history. Genghis Khan's unification of the Mongol tribes in 1206 and the subsequent conquest of northern China
• Razia: Razia, or Razia Sultana, was the daughter of Iltutmish and the first and only woman to rule the Delhi Sultanate, reigning from 1236 to 1240. An able administrator who discarded the veil and appointed the Abyssinian Yaqut to high office, she alienated the Turkish nobility of the Chahalgani, who deposed and killed her in 1240. Her reign is a landmark UPSC fact on women rulers and the politics of the early Sultanate. Her 1236-1240 reign as Delhi's only woman Sultan
• Razia Sultana: Razia Sultana (r. 1236-1240) was the only woman to rule the Delhi Sultanate, nominated by her father Iltutmish over his sons. She asserted royal authority, appointed the Abyssinian Jamal-ud-Din Yaqut to high office and discarded the purdah in court, provoking the Turkish nobility (the Chahalgani), who deposed and killed her in 1240. She is key for Delhi Sultanate and gender-in-history questions. Her coins bearing her name and royal titles as Sultan.
• first and only woman to rule the Delhi Sultanate: First and only woman to rule the Delhi Sultanate is Razia Sultana, daughter of Iltutmish, who reigned from 1236 to 1240. She discarded the veil, led military campaigns, and asserted royal authority over a hostile Turkish nobility before being deposed and killed. Her reign shows both the possibilities and limits of female sovereignty in medieval India. It matters for UPSC because Sultanate gender and nobility politics recur in prelims and mains. Razia Sultana, Sultan of Delhi, 1236-1240
• Chahalgani, "the Forty: The Chahalgani, the Corps of Forty, was the select group of forty Turkish nobles created by Iltutmish (r. 1211-1236) as the trusted elite of the Delhi Sultanate. Raised to check factionalism and stabilize the Sultan's authority, after his death they grew so powerful that they made and unmade Sultans, dominating Raziya's reign. For UPSC, they illustrate the structural weakness of early Turkish rule: a military oligarchy the monarch had to break before centralized power was possible. Ghiyasuddin Balban, himself once a member of the Forty, systematically destroyed the Chahalgani through executions, demotions, and confiscations after becoming Sultan in 1266.
• Malik Yakut: Malik Yakut, or Jamal-ud-Din Yaqut, was an Abyssinian (Habshi) slave whom Razia Sultana elevated to the high office of Amir-i-Akhur (superintendent of the royal stables). His rapid rise provoked the jealousy of the Turkish nobility and became a focal point of the rebellion that deposed Razia in 1240, when Yaqut was killed in the conflict with the rebel governor Altunia. For UPSC, he illustrates slave mobility and factional politics in the early Sultanate. Altunia's 1240 rebellion, in which Yaqut was killed
• Bahram Shah: Bahram Shah (r. 1240-1242) was the third son of Iltutmish to occupy the Delhi throne, placed there by the Chihalgani, the corps of forty Turkish nobles, after they deposed Razia Sultan. A weak ruler dominated by the very nobles who elevated him, he was murdered in 1242 during a conflict with the Turkish oligarchy. For UPSC, his reign illustrates the factional instability of the early Mamluk Sultanate between Iltutmish and Balban. His assassination in 1242 at the hands of the Turkish nobles, who then raised Ala-ud-din Masud Shah to the throne.
• Ghiyasuddin Balban: Ghiyasuddin Balban was the ninth Sultan of Delhi, ruling from 1266 to 1287. He crushed the power of the Chahalgani, the group of forty Turkish nobles, created the Diwan-i-Arz military department, and promoted the theory of divine kingship, styling himself Zil-i-Ilahi, the Shadow of God. He enforced strict Persian court etiquette. For UPSC, his reign illustrates the consolidation of Sultanate authority and the politics of the Turkish nobility. Balban's destruction of the Chahalgani, the corps of forty Turkish nobles
• abolished the Chahalgani: The Chahalgani was the corps of forty Turkish nobles that dominated Delhi Sultanate politics after Iltutmish's death. Ghiyasuddin Balban, who became Sultan in 1266, systematically destroyed the Chahalgani through dismissal, demotion, and execution to build a strong, centralized monarchy free of noble factions. It matters for UPSC because Balban's theory of kingship and his taming of the nobility are core topics in medieval-history questions on the Delhi Sultanate. Ghiyasuddin Balban (r. 1266-1287)
• barids: The barids are the intelligence officers and spies of the Delhi Sultanate who reported directly to the Sultan on nobles, officials and markets. Alauddin Khalji systematised them as part of his market-control regime, using their reports to enforce price regulations and check corruption. For UPSC, they show how the Sultanate built an information network to sustain centralised economic control. Barids monitored grain merchants in Delhi to ensure compliance with Alauddin's fixed prices during shortages.
• Theory of Kingship: The theory of kingship is the body of ideas explaining the origin, legitimacy, and duties of the ruler in Indian political thought. Traditions include the divine theory of the Manusmriti, the contract theory of the Shantiparva and Arthashastra (people chose a king to end matsya-nyaya, the law of the fishes), and the paternal ideal. The king's dharma centred on protection, justice, and welfare, and the theme recurs in GS-1 ancient history. Kautilya's Arthashastra
• Zil-i-illahi, the Shadow of God on earth: Zil-i-illahi, the Shadow of God on earth, is the royal title by which Delhi Sultans and Mughal emperors claimed to rule as God's vicegerent, placing the monarch's authority beyond challenge. Balban used it most forcefully to sacralize his kingship and demand absolute obedience. For UPSC, it is the classic formulation of divine-right theory in the Sultanate and a mains-ready point on medieval statecraft. Ghiyasuddin Balban's theory of kingship
• Sijda: Sijda is prostration before the Sultan, touching the forehead to the ground as a mark of submission, introduced in Delhi court protocol by Ghiyasuddin Balban (r. 1266-1287) along with paibos, the kissing of the monarch's feet. Borrowed from Persian customs, it embodied Balban's theory of divine kingship and awed the nobility. For UPSC prelims, it is a favourite fact tying Balban to the theory of kingship. Balban's introduction of sijda and paibos as Delhi court ceremonies, 1266-1287.
• Paibos: Paibos is the Persian court custom of kissing the monarch's feet, introduced into the Delhi Sultanate by Ghiyasuddin Balban along with sijda (prostration). These Iranian-origin rituals were meant to exalt the Sultan's divinity and distance him from nobles. For UPSC it is a classic prelims term on Balban's theory of kingship (1266 to 1287), illustrating how the Sultanate borrowed Persian ideas of absolute monarchy. introduced by Sultan Ghiyasuddin Balban (reigned 1266-1287)
• Zaminbos: Zaminbos was a Persian court custom of kissing the ground before the Sultan, a form of prostration introduced in the Delhi Sultanate by Ghiyasuddin Balban (r. 1266-1287), alongside sijda and paibos. These ceremonies made the sultan a semi-divine figure above the nobility. It matters for UPSC as evidence of the Persianisation of the Delhi Sultanate's kingship. Balban used such rituals to assert that the sultan was God's shadow on earth, above the Chahalgani nobles.
• Naurauz: Naurauz is the variant spelling of Nauroz (Nowruz), the Iranian New Year celebrated at the spring equinox on about 21 March. Rooted in Zoroastrian tradition, it marks renewal and the triumph of light, and in India it is observed by the Parsi community as Jamshed-i-Navroz, with Indian Parsis also keeping a second date under the Shahenshahi calendar. For UPSC it matters for festivals, Parsi culture and India-Iran cultural-linkage questions. the Parsi community of India observes Jamshed-i-Navroz, and the Balti community of Turtuk in Ladakh celebrates Nowruz
• Diwan-i-Ariz: The Diwan-i-Ariz was the military department of the Delhi Sultanate, headed by the Ariz-i-Mumalik, responsible for organising, equipping and maintaining the army. Under Alauddin Khalji it kept descriptive rolls of soldiers and branded horses (dagh) to prevent fraud. For UPSC, it shows how the Sultanate built a centralised standing army. Alauddin Khalji's standing army, maintained through the dagh and chehra system, was administered through this department.
• Blood and Iron" policy: The Blood and Iron policy is Otto von Bismarck's doctrine, proclaimed in 1862, that the unification of Germany would be achieved not by speeches and parliamentary resolutions but by war and industrial-military power. As Prussian chancellor he pursued it through wars against Denmark in 1864, Austria in 1866 and France in 1870-71, culminating in the German Empire of 1871. For UPSC, it is central to world-history questions on German unification and 19th-century European nationalism. the Franco-Prussian War of 1870-71, which completed German unification
• transferable and non-hereditary: A transferable and non-hereditary jagir is a Mughal revenue assignment granted to a mansabdar that could be reassigned by the emperor and never passed to the holder's heirs, reverting to the state on death. This kept nobles dependent on imperial favour and blocked a hereditary landed aristocracy. It is a core GS-1 medieval history concept for Mughal administration and the mansabdari system. the jagir assignments documented in the Ain-i-Akbari
• first true arch: The first true arch in Indo-Islamic architecture appears in the tomb of Ghiyasuddin Balban at Delhi (c. 1287), assembled from wedge-shaped voussoirs that carry weight in compression. Earlier structures such as the Arhai Din ka Jhonpra at Ajmer use corbelled arches, not true arches. It matters for UPSC as the marker of the arrival of true arch construction in Indo-Islamic architecture. The true arch in Balban's own tomb at Delhi (c. 1287).
• Khaljis: The Khaljis were the second dynasty of the Delhi Sultanate, ruling from 1290 to 1320 and remembered chiefly for Alauddin Khalji (1296 to 1316). Alauddin repelled Mongol invasions, conquered Gujarat, Malwa and much of the Deccan, and imposed the Sultanate's most famous market controls and price regulation from Delhi. The dynasty matters for prelims medieval history on Sultanate administration and for mains on statecraft and agrarian revenue. Alauddin Khalji's market reforms and price control system
• Iqta: Iqta is a revenue assignment granted by the Sultan in exchange for military and administrative service. The holder collected the assigned revenue, maintained troops and remitted the balance to the centre. It matters for GS Paper 1 because it financed the Sultanate army without a cash paid bureaucracy. Under Iltutmish in the 1220s CE, iqtas around Delhi paid for the cavalry that held the Doab.

How the early Sultans held the state together

The first Sultans ruled as representatives of the Caliph in form and as autonomous sultans in practice. Iltutmish (r. 1211 to 1236 CE) sought investiture from Baghdad because legitimacy helped him face rival Turkish nobles, yet he took every real decision in Delhi. The distinction matters for GS Paper 1, since the Sultanate was never governed from Baghdad.

Policy balanced three pulls: Quran and Shariat ideals, clerical pressure, and siyasat, meaning practical statecraft. When the ulema pressed for a single religious code, Iltutmish refused, judging that a largely non Muslim population could not be ruled that way. Early jizya stayed low and unevenly collected, which historians read as revenue pragmatism rather than zeal.

Roads carried the state. Maintained highways with rest houses and patrols curbed Mewati and Rajput banditry around Delhi and the Doab, and safer routes drew Persian and Central Asian trade towards Indian markets. Security, revenue and legitimacy thus reinforced each other in the first Sultanate century, c. 1206 to 1290 CE.