Khatu Shyam, also known as Barbareek, is the grandson of Pandava Bhima. He willingly gave his head in charity to Lord Krishna before the Mahabharata war. It is said that the head of Khatu Shyam was placed atop a hill near the Kurukshetra and it watched the entire Mahabharata war from there. In his previous birth Khatu Shyam was a Yaksha. Once when Adharma (evil) grew out of control on earth, Vishnu agreed to the prayers of Devas and humans and agreed to take an avatar to bring back Dharma. A Yaksha named Suryavarcha said that not Vishnu but he alone could relieve earth’s burden. For this arrogance he was cursed by Brahma to be born on earth and said that whenever there is an opportunity to relieve earth’s burden he would die at the hands of Krishna . Later Khatu Shyam was born as the son of Ghatotkachch and Kamkantakata. Ghatotkachch was the son of Bhima, the second of Pandava brothers. The word about Mahabharata battle spread around the world and Barbareek too