Bhagavatapurana 9.23.10

9.23.10

prajāmadāddaśaratho yena lebhe 'prajāḥ prajāḥ /
caturaṅgo romapādāt pṛthulākṣastu tatsutaḥ //

10. By that blessing the childless king had issues. Romapada's son was Chaturanga and his son Pruthulaksha.

9. By amusing him with their dancing and music, instrumental and vocal, and by their charming behaviour, embraces and presents. The Rishi superintended the Ishti, performed to propitiate Indra, of Dasaratha who had no issue, and bestowed the blessing of having an issue on Dasaratha.