A coin featuring a horseman was issued to celebrate the Muslim conquest of Lakhnauti with inscriptions in Sanskrit and Arabic. 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. 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. The Delhi army continued to fend off the new Bengali army. The Bengal-Delhi War ended in 1359 when Delhi recognized the independence of Bengal. Ilyas Shah's son Sikandar Shah defeated Delhi Sultan Firuz Shah Tughluq during the Siege of Ekdala Fort. A subsequent peace treaty recognized Bengal's independence and Sikandar Shah was gifted a golden crown by the Sultan of Delhi. The ruler of Arakan sought refuge in Bengal during the reign of Ghiyasuddin Azam Shah. Jalaluddin Muhammad Shah later helped the Arakanese king to regain control of his throne in exchange for becoming a tributary state of the Bengal Sultanate. Bengali influence in Arakan persisted for 300 years.  Bengal also helped the king of Tripura to regain control of his throne in exchange for becoming a tributary state. The ruler of the Jaunpur Sultanate also sought refuge in Bengal. The vassal states of Bengal included Arakan, Tripura, Chandradwip and Pratapgarh. At its peak, the Bengal Sultanate's territory included parts of Arakan, Assam, Bihar, Orissa, and Tripura. The Bengal Sultanate experienced its greatest military success under Alauddin Hussain Shah, who was proclaimed as the conqueror of Assam after his forces led by Shah Ismail Ghazi overthrew the Khen dynasty and annexed large parts of Assam. In maritime trade, the Bengal Sultanate benefited from Indian Ocean trade networks and emerged as a hub of re-exports. A giraffe was brought by African envoys from Malindi to Bengal's court and was later gifted to Imperial China. Ship-owing merchants acted as envoys of the Sultan while travelling to different regions in Asia and Africa. Many rich Bengali merchants lived in Malacca. Bengali ships transported embassies from Brunei, Aceh and Malacca to China. Bengal and the Maldives had a vast trade in shell currency. The Sultan of Bengal donated funds to build schools in the Hejaz region of Arabia.

The five dynastic periods of the Bengal Sultanate spanned from the Ilyas Shahi dynasty, to a period of rule by Bengali converts, to the Hussain Shahi dynasty, to a period of rule by Abyssinian usurpers; an interruption by the Suri dynasty; and ended with the Karrani dynasty. The Battle of Raj Mahal and the capture of Daud Khan Karrani marked the end of the Bengal Sultanate during the reign of Mughal Emperor Akbar. In the late 16th-century, a confederation called the Baro-Bhuyan resisted Mughal invasions in eastern Bengal. The Baro-Bhuyan included twelve Muslim and Hindu leaders of the Zamindars of Bengal. They were led by Isa Khan, a former prime minister of the Bengal Sultanate. By the 17th century, the Mughals were able to fully absorb the region to their empire.

ムガル帝国時代

イギリス植民地時代 (1547年 - 1947年)

ベンガル分割

年譜 
 紀元前600年頃
マガダ国をはじめとした十六大国が割拠。