Kahalgaon in the context of Bhagalpur district

The Jaunpur Sultanate (Persian: سلطنت جونپور) was a late medieval Indian Muslim state which ruled over much of what is now the Indian states of Uttar Pradesh and Bihar and southern Nepal between 1394 and 1494. It was founded in 1394 by Khwajah-i-Jahan Malik Sarwar, a eunuch slave and former wazir of Sultan Nasiruddin Muhammad Shah IV Tughluq, amidst the disintegration of the Delhi Sultanate's Tughlaq dynasty. Centred in Jaunpur, the Sultanate extended authority over a large part of the Ganges-Yamuna Doab. It reached its greatest height under the rule of Sultan Ibrahim Shah, who also vastly contributed to the development of Islamic education in the Sultanate. In 1494, Sultan Hussain Shah Sharqi was defeated by the forces of the Afghan ruler Bahlul Lodi, Sultan of the Lodi dynasty of the Delhi Sultanate at Benares at which point Hussain fled to Kahalgaon in modern-day Bihar where the Sultan of Bengal assigned him a pargana. Here he was allowed to mint his own coins and was promised help from Bengal in recovering his kingdom. He died in 1505.

Vikramashila (IAST: Vikramaśilā) was a Buddhist monastic university situated in what is now modern-day Bihar in India. It was founded by King Dharmapala between the late eighth and early ninth century.

It was one of the three most important Buddhist Mahaviharas of its time in India, along with Nalanda and Odantapuri. Its location is now the site of Antichak village near Kahalgaon, Bhagalpur district in Bihar. It was one of the largest Buddhist mahaviharas, with more than one hundred teachers and about one thousand students. It produced eminent scholars who were often invited by foreign countries to spread Buddhist learning, culture and religion including Atiśa and Ratnākaraśānti.