Sultanate. This was in addition to the daughter he fathered by marrying a Muslim woman in India. Ibn Battuta also records that Muhammad Tughlaq sent along with his emissaries, both slave boys and slave girls as gifts to other countries such as China. Muslim nobility and revolts The Tughlaq dynasty experienced many revolts by Muslim nobility, particularly during Muhammad bin Tughlaq but also during other rulers such as Firoz Shah Tughlaq. The Tughlaqs had attempted to manage their expanded empire by appointing family members and Muslim aristocracy as na'ib () of Iqta' (farming provinces, ) under contract. The contract would require that the na'ib shall have the right to force collect taxes from non-Muslim peasants and local economy, deposit a fixed sum of tribute and taxes to Sultan's treasury on a periodic basis. The contract allowed the na'ib to keep a certain amount of taxes they collected from peasants as their income, but the contract required any excess tax and seized property collected from non-Muslims to be split between na'ib and Sultan in a 20:80 ratio (Firuz Shah changed this to 80:20 ratio). The na'ib had the right to keep soldiers and officials to help extract taxes. After contracting with Sultan, the na'ib would enter into subcontracts with Muslim amirs and army commanders, each granted the right over certain villages to force collect or seize produce and property from dhimmis. This system of tax extraction from peasants and sharing among Muslim nobility led to rampant corruption, arrests, execution and rebellion. For example, in the reign of Firoz Shah Tughlaq, a Muslim noble named Shamsaldin Damghani entered into a contract over the iqta' of Gujarat, promising enormous sums of annual tribute while entering the contract in 1377 AD. He then attempted to force collect the amount deploying his coterie of Muslim amirs, but failed. Even the amount he did manage to collect, he paid nothing to Delhi. Shamsaldin Damghani and Muslim nobility of Gujarat then declared rebellion and separation from Delhi Sultanate. However, the soldiers and peasants of Gujarat refused to fight the war for the Muslim nobility. Shamsaldin Damghani was killed. During the reign of Muhammad Shah Tughlaq, similar rebellions were very common. His own nephew rebelled in Malwa in 1338 AD; Muhammad Shah Tughlaq attacked Malwa, seized his nephew, and then flayed him alive in public. Downfall The provinces of Deccan, Bengal, Sindh and Multhan had become independent during