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Governors in Lakhnauti, Satgaon and Sonargaon declared independence from Delhi. This allowed the ruler of Sonargaon, Fakhruddin Mubarak Shah, to annex Chittagong to the Islamic administration. By 1352, the ruler of Satgaon, Shamsuddin Ilyas Shah, unified the region into an independent state. Ilyas Shah established his capital in Pandua. The new breakaway state emerged as the Bengal Sultanate, which developed into a territorial, mercantile and maritime empire. At the time, the Islamic world stretched from Muslim Spain in the west to Bengal in the east.
The initial raids of Ilyas Shah saw the first Muslim army enter Nepal and stretched from Varanasi in the west to Orissa in the south to Assam in the east.
An abortive Islamic invasion of Tibet was also mounted by Bakhtiyar. Bengal was under the formal rule of the Delhi Sultanate for approximately 150 years. Delhi struggled to consolidate control over Bengal. Rebel governors often sought to assert autonomy or independence. Sultan Iltutmish re-established control over Bengal in 1225 after suppressing the rebels. Due to the considerable overland distance, Delhi's authority in Bengal was relatively weak. It was left to local governors to expand territory and bring new areas under Muslim rule, such as through the Conquest of Sylhet in 1303.
In 1338, new rebellions sprung up in Bengal's three main towns.