He was a beneficent pious prince. He is the hero of Vikramorvashi Natak of Kalidasa. His actual name was Vikrama. He fell in love with Urvashi, a nymph from heaven, who gave birth to his eldest son Ayus. Puru was the sixth king of the Lunar race and the youngest son of Yayati and Sarmishtha.
He and his brother Yadu (see the above genealogy) were founders of the two great branches of the Lunar race. The descendants of Puru were called Pauravas, and of this race came the Kauravas and Yadavas. Among the Yadavas or descendants of Yadu was Krishna.
References :
1. Kohli,Surindar Singh ed,Dictionary of Mythological References in Guru Granth Sahib 1993