Short answers, pulled from the story.
King Dharmapala of the Pala Empire established Vikramashila between the late eighth and early ninth century. He ruled from 783 to 820 CE and created the university in response to a perceived decline in scholarship at Nalanda.
Vikramaśīla focused heavily on Vajrayana Buddhism and employed Tantric preceptors as its primary branch of study. The institution also taught philosophy, grammar, metaphysics, and Indian logic alongside its core religious curriculum.
Forces led by Muhammad bin Bakhtiyar Khalji destroyed Vikramashila around 1193. Following this collapse, many monks fled to Nepal and Tibet while most manuscripts within the library were lost to historical upheavals and natural decay.
Meticulous excavation began at Kahalgaon in Bhagalpur district between 1960 and 1969 under B. P. Sinha. The Archaeological Survey of India continued work from 1972 to 1982 to uncover the ruins of the ancient monastery.
Roughly 108 scholars and 160 professors taught within the complex during its peak operation. About 1,000 resident monks lived inside the walls while Great Scholars held the title Mahapañdita and ordinary scholars were Pañditas.