according to the shatapatha brahmana, pururavas was the son of budha (himself often described as the son of soma) and the gender-switching deity ila (born as the daughter of manu). pururavas's great-grandson was yayati, who had five sons named yadu, turvasu, druhyu, anu, and puru. these seem to be the names of five vedic tribes as described in the vedas.