The Khalji dynasty (Bengali: খলজি রাজবংশ, Persian: خاندان خلجی) was the first Muslim dynasty to rule the Bengal region in the Indian subcontinent. The dynasty, which hailed from the Garmsir region of present-day Afghanistan, was founded in 1204 by Muhammad Bakhtiyar Khalji, a Muslim Turko-Afghan general of the Ghurid Empire. The Khaljis initially pledged allegiance to Sultan Muhammad of Ghor until his death in 1206, though their rule in Bengal was mostly independent. Under the rule of Iwaz Khalji, Bengal experienced major developments such as its first naval force, flood defence systems and linkage with the Grand Trunk Road. The dynasty was based in the city of Lakhnauti in northern Bengal, later expanding eastwards and southwards. Nasiruddin Mahmud, the son of Mamluk sultan Iltutmish of Delhi managed to conquer Bengal in 1227; although the Khaljis briefly reasserted their independence, they surrendered to the Mamluks in 1231, who replaced them with a series of regional governors.
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Khalji dynasty of Bengal in the context of Muhammad Bakhtiyar Khalji
Ikhtiyār al-Dīn Muḥammad Bin Bakhtiyār Khaljī (Persian: اختیارالدین محمد بن بختیار خلجی), also known as Bakhtiyar Khalji, (Bengali: বখতিয়ার খলজি, romanized: Bokhtiyar Kholjī), was a Turko-Afghan Military General of the Ghurid ruler Muhammad of Ghor, who led the Muslim conquests of the eastern Indian regions of Bengal and parts of Bihar and established himself as their deputy-ruler/governor, He was the founder of the Khalji dynasty of Bengal, ruling Bengal for a short period, from 1203 to 1227 CE.
Khalji's invasions of the Indian subcontinent between A.D. 1197 and 1206 led to mass flight and massacres of monks, and caused damage to the traditional Buddhist institutions of higher learning in Northern India. In Bengal, Khalji's reign was responsible for the displacement of Buddhism. The leading centre of teaching for Mahayana Buddhism was Nalanda. At the end of the 12th century, Bakhityar Khalji demolished the monastery in a brutal sacking.
Khalji dynasty of Bengal in the context of Subahdar
Subahdar was one of the designations of a governor of a Subah (province) during the Khalji dynasty of Bengal, Mamluk dynasty, Khalji dynasty, Tughlaq dynasty, and the Mughal era who was alternately designated as Sahib-i-Subah or Nazim. The word, Subahdar is of Persian origin. The Subahdar was the head of the Mughal provincial administration. He was assisted by the provincial Diwan, Bakhshi, Faujdar, Kotwal, Qazi, Sadr, Waqa-i-Navis, Qanungo and Patwari. The Subahdars were normally appointed from among the Mughal princes or the officers holding the highest mansabs (ranks).