monks and nuns killed during the 12th and 13th centuries in the Gangetic plains region. The Islamic invasions plundered wealth and destroyed Buddhist images. The Buddhist university of Nalanda was mistaken for a fort because of the walled campus. The Buddhist monks who had been slaughtered were mistaken for Brahmins according to Minhaj-i-Siraj. The walled town, the Odantapuri monastery, was also conquered by his forces. Sumpa basing his account on that of Śākyaśrībhadra who was at Magadha in 1200, states that the Buddhist university complexes of Odantapuri and Vikramshila were also destroyed and the monks massacred. forces attacked the north-western regions of the Indian subcontinent many times. Many places were destroyed and renamed. For example, Odantapuri's monasteries were destroyed in 1197 by Mohammed-bin-Bakhtiyar and the town was renamed. Likewise, Vikramashila was destroyed by the forces of Muhammad bin Bakhtiyar Khilji around 1200. Many Buddhist monks fled to Nepal, Tibet, and South India to avoid the consequences of war. Tibetan pilgrim Chöjepal (1179–1264), who arrived in India in 1234, had to flee advancing troops multiple times, as they were sacking Buddhist sites. The north-west parts of the Indian subcontinent fell to Islamic control, and the consequent take over of land holdings of Buddhist monasteries removed one source of necessary support for the Buddhists, while the economic upheaval and new taxes on laity sapped the laity support of Buddhist monks. Not all monasteries were destroyed by the invasions (Somapuri, Lalitagiri, Udayagiri), but since these large Buddhist monastic complexes had become dependent on the patronage of local authorities, when this patronage dissipated, they were abandoned by the sangha. In the north-western parts of medieval India, the Himalayan regions, as well as regions bordering central Asia, Buddhism once facilitated trade relations, states Lars Fogelin. With the Islamic invasion and expansion, and central Asians adopting Islam, the trade route-derived financial support sources and the economic foundations of Buddhist monasteries declined, on which the survival and growth of Buddhism was based. The arrival of Islam removed the royal patronage to the monastic tradition of Buddhism, and the replacement of Buddhists in long-distance trade by the eroded the related sources of patronage. Decline under Islamic rule After the conquest, Buddhism largely disappeared from most of India, surviving in the Himalayan regions and south India. Abul Fazl stated that there was scarcely any trace of Buddhists left. When he visited Kashmir in 1597, he met with a few