The Bhāgavat traditions of Hinduism invoke Bhagavan in Narayan Upakheyam and in the Bhagavad Gita of Bhishma Parva of the Mahabharata. The devotion to Lord Vishnu (identified as Vasudeva in Mahabharata) is described as ten incarnations of Vishnu. It introduced the Chatur - vyuha concept and laid emphasis on the worship of five Vrisini-warriors, reached the peak of its popularity during the Gupta Period.