This is even more true of the Panjab, the frontier provinces and Kashmir. The older invaders such as the Yüeh-chih had been favourably disposed to Buddhism, but those who came later, such as the Huns, were predaceous barbarians with little religion of any sort. In Hsüan Chuang's time it was only in Udyana that Buddhism could be said to be the religion of the people and the torrent of Mohammedan invasion which swept continuously through these countries during the middle ages overwhelmed all earlier religions, and even Hinduism had to yield. In Kashmir Buddhism soon became corrupt and according to the Râjataranginî[268] the monks began to marry as early as the sixth century. King Lâlitâditya (733-769) is credited with having built monasteries as well as temples to the Sun, but his successors were Sivaites. Bengal, especially western Bengal and Bihar, was the stronghold of decadent Buddhism, though even here hostile influences were not absent. But about 730 A.D. a pious Buddhist named Gopâla founded the Pâla dynasty and extended his power over Magadha. The Pâlas ruled for about 450 years and supplied a long and devout line of defenders of the faith. But to the east of their dominions lay the principality of Kanauj, a state of varying size and fortunes and from the eighth century onwards a stronghold of Brahmanic learning. The revolution in Hinduism which definitely defeated, though it did not annihilate Buddhism, is generally connected with the names of Kumâriḷa Bhatta (_c._ 750) and Śaṅkara (_c._ 800). We know the doctrines of these teachers, for many of their works have come down to us, but when we enquire what was their political importance, or the scope and extent of the movement which they championed we are conscious (as so often) of the extraordinary vagueness of Indian records even when the subject might appeal to religious and philosophic minds.[269] Kumâriḷa is said to have been a Brahman of Bihar who abjured Buddhism for Hinduism and raged with the ardour of a proselyte against his ancient faith. Tradition[270] represents him as instigating King Sudhanvan to exterminate the Buddhists. But nothing is known of this king and he cannot have had the extensive empire with which he is credited.