A sage. He was once copulating with his wife. The couple had taken on the form of deers. Pandu had come there for a hunt and he sent an arrow to kill the male deer. The arrow struck its mark and the sage transformed into his normal self. He cursed Pandu and said that if the king ever attempted intercourse with his wife, he would die. After many years, Pandu, in a moment of passion, forgot about this curse, and embraced his wife Madri. He dies immediately as per Mahabharata Adiparva Chapter 117.