text: Three early influential monastic fraternities are traceable in Buddhist history. The Mahavihara established by Mahinda was the oldest. Later, in 1st century BCE, King Vattagamani donated the Abhayagiri vihara to his favored monk, which led the Mahavihara fraternity to expel that monk. In 3rd century CE, this repeated when King Mahasena donated the Jetavana vihara to an individual monk, which led to his expulsion. The Mahinda Mahavihara led to the orthodox Theravada tradition. The Abhayagiri vihara monks, rejected and criticized by the orthodox Buddhist monks, were more receptive to heterodox ideas and they nurtured the Mahayana tradition. The Jetavana vihara monks vacillated between the two traditions, blending their ideas.
  Viharas of the Pāla era
  A range of monasteries grew up during the Pāla period in ancient Magadha (modern Bihar) and Bengal. According to Tibetan sources, five great mahaviharas stood out: Vikramashila, the premier university of the era; Nalanda, past its prime but still illustrious, Somapura, Odantapurā, and Jagaddala. According to Sukumar Dutt, the five monasteries formed a network, were supported and supervised by the Pala state. Each of the five had their own seal and operated like a corporation, serving as centers of learning.
  Other notable monasteries of the Pala Empire were Traikuta, Devikota (identified with ancient Kotivarsa, 'modern Bangarh'), and Pandit Vihara. Excavations jointly conducted by the Archaeological Survey of India and University of Burdwan in 1971–1972 to 1974–1975 yielded a Buddhist monastic complex at Monorampur, near Bharatpur via Panagarh Bazar in the Bardhaman district of West Bengal. The date of the monastery may be ascribed to the early medieval period. Recent excavations at Jagjivanpur (Malda district, West Bengal) revealed another Buddhist monastery (Nandadirghika-Udranga Mahavihara) of the ninth century.