Explanation:


Delhi Sultans: Delhi Sultanate was a Muslim empire based in Delhi that stretched over large parts of the Indian subcontinent for 320 years (1206–1526). The five dynasties that ruled during this time were the Mamluk dynasty (1206–1290), the Khalji dynasty (1290–1320), the Tughlaq dynasty (1320–1414), the Sayyid dynasty (1414–1451), and the Lodi dynasty (1451–1526).




Balban: Ghiyas ud din Balban (reigned: 1266–1287) was the ninth sultan of the Mamluk dynasty of Delhi. Balban was a capable ruler who was able to suppress rebellions and strengthen the sultanate's administrative structure. He did not go for any fresh conquests and focused on consolidating the territories that had already been conquered by his predecessors.




Bahlul Lodi: Bahlul Lodi (reigned: 1451–1489) was the founder of the Lodi dynasty. He came to power after overthrowing the last Sayyid ruler. Bahlul Lodi was an able administrator and military commander. He expanded the sultanate's territory by conquering Jaunpur, Etawah, and Katehr.




Firuz Tughlaq: Firuz Shah Tughlaq (reigned: 1351–1388) was the third ruler of the Tughlaq dynasty. He was a patron of art and architecture, and many of Delhi's famous monuments were built during his reign. Firuz Tughlaq was also a successful military commander who expanded the sultanate's territory by conquering Bengal and parts of southern India.




Iltutmish: Iltutmish (reigned: 1211–1236) was the second ruler of the Mamluk dynasty. He was a capable ruler who was able to suppress rebellions and expand the sultanate's territory. Iltutmish conquered territories in northern India, including Bengal and Bihar. He also established a centralized administrative structure and introduced the silver tanka as the sultanate's currency.




Conclusion: Balban is the Delhi Sultan who did not go for any fresh conquests.