SB 9.6.19
jitva param dhanam sarvam
sastrikam vajra-panaye
pratyayacchat sa rajarsir
iti namabhir ahrtah
Translation by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada:
After conquering the enemy, the saintly king Purañjaya gave everything, including the enemy’s riches and wives, to Indra, who carries a thunderbolt. For this he is celebrated as Purañjaya. Thus Purañjaya is known by different names because of his different activities.