SB 9.6.13
krtanta asit samaro
devanam saha danavaih
parsnigraho vrto viro
devair daitya-parajitaih
Translation by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada:
Formerly, there was a devastating war between the demigods and the demons. The demigods, having been defeated, accepted Purañjaya as their assistant and then conquered the demons. Therefore this hero is known as Purañjaya, “he who conquered the residence of the demons.”