Ikhtiyār al-Dīn Muḥammad Bakhtiyār Khaljī

The Muslim invader Bakhtīyār Khaljī made Deoghar his capital in 1201 after the conquest of Bihar. It was constituted a municipality in 1869.

…the meantime, an obscure adventurer, Ikhtiyār al-Dīn Muḥammad Bakhtiyār Khaljī of the Ghūrid army, conquered Nadia, the capital of the Sena kings of Bengal (1202). Within two years Bakhtiyār embarked on a campaign to conquer Tibet in order to plunder the treasure of its Buddhist monasteries, and in 1206 he…