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

1. The question asks about the Delhi Sultan known for building the most extensive network of canals in India. 2. While Ghiyasuddin Tughlaq initiated canal construction, his reign was short. 3. Feroz Shah Tughlaq is renowned for his extensive public works, including the construction and repair of a vast network of canals for irrigation, significantly boosting agriculture. Notable canals include the Western Yamuna Canal and Sutlej canal systems. 4. Iltutmish and Sikandar Lodi were important sultans but are not primarily known for extensive canal building on the scale of Feroz Shah Tughlaq.