The cause for decline of Delhi Sultanate was/were? A) Weak Government B) Invasion Timur C) Lack of clear-cut succession policy D) All of these Related MCQs: Which sultan of Delhi sultanate defeated the ruler of Gwalior Man Sing Tomar ? The term Delhi Sultanate used to cover? Rukn-ud-din Firuz ruled the Delhi sultanate about ….. ? The major source of royal income during Delhi sultanate was?