Answer: Balban
Notes: Ghiyas-ud-din Balban, the Sultan of Delhi, appointed spies to monitor the activities of the nobles. Balban created a powerful spy network to keep an eye on the nobles and the common people. He appointed spies, called "Barids", to watch the activities of his governors, military and civil officers, and even his own sons. The spies were well-paid and reported suspicious activities to Balban. Balban was determined to break the power of the Turkish nobles. He spared only the most obedient nobles and eliminated all others by fair or foul means. For example, he publicly flogged Malik Baqbaq, the governor of Badaun, for his cruelty towards his servants. Balban's strong army helped him to quell rebellions and invasions from neighboring kingdoms.
