Sarvastivadin One of the main branches of Indian Abhidharma that was instrumental in the creation of Yogacara doctrine. Its system of monastic rules Vinaya is still used in the Gelukpa school of Tibetan Buddhism.
A milestone in the decline of Indian Buddhism occurred in 1193 when Muhammad Khilji burned a major Buddhist library. By the end of the 12th century, following the Islamic conquest of the Buddhist stronghold in Bihar, Buddhists ceased to be a significant presence in India. Some of the survivors retreated into Nepal and Tibet, or escaped to the south of the subcontinent. The remnants of their culture lingered on even as far west as Turkestan.