First Rajgir, Second vaishali, Third patliputraFourth Buddhist Council is the name of two separate Buddhist council meetings first in Sri Lanka and another at Sarvastivada school, in Kashmir around the First Century AD.
During the reign of Dhruva (c. 780 – 793 CE), the Rashtrakuta kingdom expanded into an empire that encompassed all of the territory between the Kaveri River and Central India. He led successful expeditions to Kannauj and defeated the King Nagabhatta II. He also defeated the Palas of Bengal (Dharmapala).
The Pala ruler ‘Devapala’ was succeeded by Vigrahapala. Vigrahapala ruled for about 3 or 4 years after that, he abdicated his throne and began to live the life of an ascetic.