The Sultan of Delhi who is reputed to have built the biggest network of canals in India was

1. Agrarian Administration in the Delhi Sultanate (basic)

To understand the medieval Indian economy, we must first look at the backbone of the state: Agrarian Administration. Between 1206 and 1526, the Delhi Sultanate was ruled by five successive dynasties — the Slave, Khalji, Tughlaq, Sayyid, and Lodi dynasties History, class XI (Tamilnadu state board 2024 ed.), Advent of Arabs and Turks, p.136. For these rulers, land was the primary source of wealth, and managing it required a balance between military control and economic extraction.

The most defining feature of this administration was the Iqta System. Unlike modern land ownership, the Sultan assigned specific territories (Iqtas) to nobles, known as Iqtadars or Muqtis. Their job was two-fold: to govern the region and to collect land revenue. From this revenue, the Iqtadar would deduct his own salary and the costs of maintaining a required number of troops for the Sultan, sending the surplus (fawazil) to the central treasury Exploring Society: India and Beyond, Class VIII, NCERT, Reshaping India’s Political Map, p.53. This system ensured that the state could maintain a large standing army without paying every soldier directly from the center History, class XI (Tamilnadu state board 2024 ed.), The Mughal Empire, p.203.

Beyond revenue collection, the Sultanate realized that the treasury could only grow if the land produced more. This led to significant state-sponsored irrigation projects, particularly under the Tughlaq dynasty. While Ghiyasuddin Tughlaq is noted for early efforts like blocking the Yamuna to create artificial lakes History, class XI (Tamilnadu state board 2024 ed.), Advent of Arabs and Turks, p.152, it was Firuz Shah Tughlaq who transformed the landscape. He commissioned a vast network of canals from rivers like the Yamuna and Sutlej, effectively turning arid patches into fertile, revenue-generating fields. This proactive "public-works" approach was a precursor to modern irrigation management in India.

Sources: History, class XI (Tamilnadu state board 2024 ed.), Advent of Arabs and Turks, p.136, 152; Exploring Society: India and Beyond, Class VIII, NCERT, Reshaping India’s Political Map, p.53; History, class XI (Tamilnadu state board 2024 ed.), The Mughal Empire, p.203

2. Rise of the Tughlaq Dynasty (basic)

The Tughlaq Dynasty rose to power in 1320 CE, following the decline of the Khalji dynasty and a brief period of instability. The founder, Ghiyas-ud-din Tughlaq (formerly Ghazi Malik), established a reign characterized by a policy of reconciliation. Unlike the rigid and often harsh centralizing measures of Alauddin Khalji, Ghiyas-ud-din sought to win over the nobility and stabilize the state's agrarian base by returning lands and adopting a more moderate approach to revenue collection History, class XI (Tamilnadu state board 2024 ed.), Advent of Arabs and Turks, p.144. This shift was crucial for the medieval Indian economy, as it moved from extreme extraction toward sustainable agricultural growth. Following Ghiyas-ud-din's death in 1325, his son Jauna Khan ascended the throne as Muhammad bin Tughlaq. While he was a deeply learned and talented innovator, his reign became a series of ambitious experiments—such as the introduction of token currency and the shifting of the capital—that often faced severe practical challenges History, class XI (Tamilnadu state board 2024 ed.), Advent of Arabs and Turks, p.144. However, from an economic standpoint, the Tughlaq era is most significant for its transition toward large-scale state-sponsored infrastructure. This economic philosophy reached its peak under Firuz Shah Tughlaq, who succeeded Muhammad. Firuz Shah reversed many of his predecessor's strict policies by reducing taxes, increasing the salaries of officials, and reintroducing hereditary appointments to administrative offices History, class XI (Tamilnadu state board 2024 ed.), Advent of Arabs and Turks, p.146. His most lasting economic contribution was the development of a vast canal irrigation system, sourcing water from rivers like the Yamuna and Sutlej to bring semi-arid lands under cultivation, thereby boosting agrarian revenue through production rather than just taxation.

Sources: History, class XI (Tamilnadu state board 2024 ed.), Advent of Arabs and Turks, p.144, 146

3. Tughlaq Urbanization and Architecture (intermediate)

The Tughlaq era (1320–1414) represents a pivotal shift in the urban and architectural landscape of medieval India. Unlike the ornate and decorative style of the preceding Khaljis, Tughlaq architecture was characterized by austerity, strength, and utility. A signature feature of this period is the 'batter' or sloping walls, which gave their forts and tombs a massive, fortress-like appearance. This was partly due to the use of cheap, locally available grey sandstone and rubble masonry rather than the expensive red sandstone or marble used later by the Mughals History, class XI (Tamilnadu state board 2024 ed.), The Mughal Empire, p.217.

From an economic standpoint, urbanization under the Tughlaqs was a tool for state-building and revenue generation. Firoz Shah Tughlaq is particularly celebrated for his vigorous public works policy. He founded numerous cities, including Firozabad (the fifth city of Delhi), Jaunpur, and Hissar. These were not merely residential hubs but served as administrative centers that integrated the surrounding agrarian economy. His most significant economic legacy was the construction of an extensive canal network—drawing water from the Yamuna, Ghaggar, and Sutlej rivers—to reclaim wasteland and boost agricultural output, which in turn funded his urban projects and the military.

However, this era of construction faced a massive setback during the reign of Nasir-uddin Muhammad Shah. The 1398 invasion by Timur saw Delhi ransacked, and critically for the history of art, Timur forcibly took Indian artisans, masons, and stone cutters back to Samarkand to build his own monuments History, class XI (Tamilnadu state board 2024 ed.), Advent of Arabs and Turks, p.147. This 'brain drain' of skilled labor explains the lull in architectural innovation in North India until the arrival of the Mughals, who later blended these Sultanate foundations with Persian influences History, class XI (Tamilnadu state board 2024 ed.), The Mughal Empire, p.217.

Feature	Tughlaq Architecture	Later Mughal Architecture
Primary Material	Grey sandstone and rubble masonry	Red sandstone and white marble
Wall Style	Sloping walls (Batter) for stability	Vertical, highly decorated walls
Aesthetic	Sober, heavy, and austere	Ornate, bulbous domes, and Pietra Dura

Sources: History , class XI (Tamilnadu state board 2024 ed.), Advent of Arabs and Turks, p.147; History , class XI (Tamilnadu state board 2024 ed.), The Mughal Empire, p.217

4. Sultanate Welfare State: Charity and Slavery (intermediate)

To understand the medieval Indian economy, we must look beyond markets and taxes to the institutional role of the state as a provider. During the Delhi Sultanate, particularly under the Tughlaq dynasty, the state transitioned from a purely military machine to a 'Welfare State'. This was not 'welfare' in the modern democratic sense, but rather a system of state-sponsored charity and institutionalized slavery designed to ensure political loyalty and social stability. A key figure here is Firuz Shah Tughlaq, who viewed the care of his subjects as a religious and administrative duty. He established departments like the Diwan-i-Khairat (Department of Charity) to assist the poor and fund the marriages of daughters from needy families, and Dar-ul-Shifa (free hospitals) to provide medical care to the masses. Slavery in this period was a complex economic pillar, far removed from the plantation slavery of the Americas. In the Sultanate, slaves (Bandagan) were often elite military or administrative assets. Early Sultans like Shams-ud-din Iltutmish rose from slavery themselves and surrounded themselves with Turkish and Mongol elite slaves who served as loyal governors and generals Tamilnadu State Board, Advent of Arabs and Turks, p.140. By the time of Firuz Shah, the number of slaves reached a staggering 180,000. He created a dedicated department, the Diwan-i-Bandagan, to manage them. These slaves were not just domestic servants; many were trained as artisans and craftsmen, effectively creating a state-controlled industrial workforce that contributed to the economy. On a social level, domestic slavery was a common feature of medieval households. Ibn Battuta observed that slaves were indispensable for tasks like carrying palanquins (dola) and that their price was often remarkably low, making them accessible to many middle-class families NCERT, Through the Eyes of Travellers, p.135. Interestingly, the status of slaves in India was often viewed as better than that in Europe; they were frequently treated as hereditary servants, their children were born free, and they could rise to the highest levels of government Spectrum, India on the Eve of British Conquest, p.78.

Department/Term	Purpose in the Welfare State
Diwan-i-Bandagan	Department of Slaves; focused on training and managing the Sultan's 1.8 lakh slaves.
Diwan-i-Khairat	Department of Charity; provided financial aid for the marriages of poor Muslim girls.
Canal Networks	Massive irrigation projects (Yamuna, Sutlej) to boost agriculture and prevent famine.

Sources: History, class XI (Tamilnadu state board 2024 ed.), Advent of Arabs and Turks, p.140; THEMES IN INDIAN HISTORY PART II, History CLASS XII (NCERT 2025 ed.), Through the Eyes of Travellers, p.135; Rajiv Ahir. A Brief History of Modern India (2019 ed.). SPECTRUM., India on the Eve of British Conquest, p.78

5. Medieval Irrigation Technology in India (intermediate)

In the medieval period, the expansion of the agrarian economy was deeply linked to state-sponsored irrigation projects. While ancient India utilized localized reservoirs and wells—notably seen in the masonry reservoirs of Dholavira THEMES IN INDIAN HISTORY PART I, History CLASS XII (NCERT 2025 ed.), Bricks, Beads and Bones, p.4—the medieval era introduced large-scale engineering and sophisticated mechanical devices that transformed the landscape.

The Delhi Sultanate, particularly the Tughlaq dynasty, marked a turning point in hydraulic engineering. Feroz Shah Tughlaq is credited with the most ambitious canal-building program in medieval India. He commissioned several major canals, drawing water from the Yamuna, Sutlej, and Ghaggar rivers to irrigate the arid regions around Hissar and Safidon. These canals were not merely for survival; they were strategic economic tools designed to convert wastelands into fertile tracts, thereby increasing Khalisa (crown land) revenue and encouraging the cultivation of superior crops like wheat and sugarcane.

Technologically, the most significant advancement was the Persian Wheel (Saqiya). Introduced or popularized during the early Mughal period, specifically during Babur's time, this device utilized pin-drum gearing to lift water from greater depths more efficiently than traditional manual methods History, class XI (Tamilnadu state board 2024 ed.), The Mughal Empire, p.217. This mechanical sophistication reached its peak under Akbar, where complex gear-wheel systems were installed to lift water to the high-elevation complexes of Fatehpur Sikri History, class XI (Tamilnadu state board 2024 ed.), The Mughal Empire, p.217.

Sources: History, class XI (Tamilnadu state board 2024 ed.), The Mughal Empire, p.217; THEMES IN INDIAN HISTORY PART I, History CLASS XII (NCERT 2025 ed.), Bricks, Beads and Bones, p.4

6. Feroz Shah Tughlaq’s Hydraulic Engineering (exam-level)

Concept: Feroz Shah Tughlaq’s Hydraulic Engineering

7. Impact of Canal Networks on Agrarian Economy (exam-level)

In the medieval Indian context, the agrarian economy was the heartbeat of the state, but it was perennially at the mercy of the monsoon. The most significant shift occurred under the Delhi Sultanate, particularly during the reign of Firuz Shah Tughlaq, who transitioned the state's role from a mere tax collector to a provider of irrigation infrastructure. By commissioning a vast network of canals from rivers like the Yamuna, Sutlej, and Ghaggar, the state effectively "drought-proofed" large tracts of the Indo-Gangetic plain. This was not merely a public work; it was a strategic investment to expand the Khalisa (crown lands) and stabilize the revenue base, as seen in his broader policy of toning up the revenue administration and reducing oppressive taxes History, class XI (Tamilnadu state board 2024 ed.), Advent of Arabs and Turks, p.146.

The availability of perennial water through these canals fundamentally altered the cropping patterns. When water resources are assured, farmers move beyond subsistence farming to Intensive Cropping (growing more than two crops in a year in orderly succession) and Double Cropping Environment, Shankar IAS Academy, Agriculture, p.357. In medieval terms, this meant a shift from low-value millets to high-value crops like sugarcane, superior wheat, and grapes. Firuz Shah himself is credited with planting over 1,200 fruit orchards around Delhi, which significantly increased the total revenue of the state by creating a surplus that could be sold in urban markets Microeconomics (NCERT class XII 2025 ed.), The Theory of the Firm under Perfect Competition, p.55.

Feature	Pre-Canal Agrarian Economy	Post-Canal (Tughlaq Era)
Risk Factor	High (Monsoon dependent)	Mitigated (Assured irrigation)
Crop Variety	Coarse grains, single-season crops	Cash crops (Sugarcane, Grapes, Wheat)
Revenue Source	Land Tax (Kharaj) primarily	Kharaj + Water Tax (Haq-i-Sharb)

Economically, these canals created a multiplier effect. Better irrigation led to higher yields; higher yields led to a greater surplus; and a greater surplus facilitated the growth of towns and trade. The state institutionalized this by introducing the Haq-i-Sharb (a water tax of 10% on the produce), ensuring that the capital invested in building the canals returned to the treasury as recurring income. This demonstrates an early understanding of how infrastructure investment shifts the supply curve and increases the overall wealth of the firm (the state) Microeconomics (NCERT class XII 2025 ed.), The Theory of the Firm under Perfect Competition, p.70.

Sources: History, class XI (Tamilnadu state board 2024 ed.), Advent of Arabs and Turks, p.146; Environment, Shankar IAS Academy, Agriculture, p.357; Microeconomics (NCERT class XII 2025 ed.), The Theory of the Firm under Perfect Competition, p.55; Microeconomics (NCERT class XII 2025 ed.), The Theory of the Firm under Perfect Competition, p.70

8. Solving the Original PYQ (exam-level)

This question synthesizes your knowledge of the Tughlaq dynasty's agrarian reforms and their shift from military expansion toward administrative consolidation. To arrive at the correct answer, you must apply the distinction between the pioneer of a policy and the ruler who scaled it into a nationwide infrastructure. While the Delhi Sultanate saw various administrative changes, the Tughlaqs uniquely identified irrigation as the key to increasing land revenue and ensuring the prosperity of the state, a concept you encountered during the study of medieval economic history.

The correct answer is (C) Feroz Shah Tughlaq. Your reasoning should focus on the phrase "biggest network." Although Ghiyasuddin Tughlaq was the first Sultan to build canals, Feroz Shah is the one who institutionalized this into a massive public works program, constructing five major canals—the most famous being the Ulughkhani and Rajabwah—which diverted water from the Yamuna and Sutlej rivers. This network was designed to facilitate the cultivation of superior crops like wheat and sugarcane, thereby boosting the state's Kharaj (land tax) collections.

UPSC often uses Option (B) Ghiyasuddin Tughlaq as a trap because he was the originator of the canal policy, but his work was limited compared to Feroz Shah's extensive grid. Iltutmish (A) is a distractor focused on the early consolidation phase and the Iqta system, long before irrigation became a state priority. Similarly, Sikandar Lodi (D) is known for founding Agra and introducing the Gazz-i-Sikandari for land measurement, making him an administrative reformer but not a builder of hydraulic networks. As noted in Medieval India: From Sultanat to the Mughals by Satish Chandra, Feroz Shah's canal system remained a landmark of medieval engineering for centuries.