After the epoch of Śaṅkara, the history of Indian Buddhism is confined to the Pâla kingdom. Elsewhere we hear only of isolated grants to monasteries and similar acts of piety, often striking but hardly worthy of mention in comparison with the enormous number of Brahmanic inscriptions. But in the Pâla kingdom[271] Buddhism, though corrupt, was flourishing so far as the number of its adherents and royal favour were concerned. Gopâla founded the monastery of Odontapuri or Udandapura, which according to some authorities was in the town of Bihar. Dharmapâla the second king of the dynasty (_c._ 800 A.D.) built on the north bank of the Ganges the even more celebrated University of Vikramaśila,[272] where many commentaries were composed. It was a centre not only of tantric learning but of logic and grammar, and is interesting as showing the connection between Bengal and Tibet. Tibetans studied there and Sanskrit books were translated into Tibetan within its cloisters. Dharmapâla is said to have reigned sixty-four years and to have held his court at Patna, which had fallen into decay but now began to revive. According to Târanâtha his successor Devapâla built Somapuri, conquered Orissa and waged war with the unbelievers who had become numerous, no doubt as a result of the preaching of Śaṅkara. But as a rule the Pâlas, though they favoured Buddhism, did not actively discourage Hinduism. They even gave grants to Hindu temples and their prime ministers were generally Brahmans who[273] used to erect non-Buddhist images in Buddhist shrines. The dynasty continued through the eleventh century and in this period some information as to the condition of Indian Buddhism is afforded by the relations between Bengal and Tibet. After the persecution of the tenth century Tibetan Buddhism was revived by the preaching of monks from Bengal. Mahîpâla then occupied the throne (_c._ 978-1030) and during his reign various learned men accepted invitations to Tibet. More celebrated is the mission of Atîsa, a monk of the Vikramaśila monastery, which took place about 1038. That these two missions should have been invited and despatched shows that in the eleventh century Bengal was a centre of Buddhist learning. Probably the numerous Sanskrit works preserved in Tibetan translations then existed in its monasteries. But about the same time the power of the Pâla dynasty, and with it the influence of Buddhism, were curtailed by the establishment of the rival Sena dynasty in the eastern provinces. Still, under Râmapâla, who reigned about 1100, the great teacher Abhayakara was an ornament of the Mahayana. Târanâtha[274] says that he corrected the text of the scriptures and that in his time there were many Pandits and resident Bhikshus in the monasteries of Vikramasîla, Bodh-Gaya and Odontapuri.