Sage · All traditions · North India · banks of the Sarasvati
Kavasha Ailusha
The seer of the hymn to the Waters and the Child of the Waters (RV 10.30). The sages sacrificing on the Sarasvati reject him as the son of a slave woman; when he recites the hymn the river follows him, and they take him back.
Sources: Rigveda Brahmanas: the Aitareya and Kausitaki Brahmanas, tr. A. B. Keith (1920) · see Kavasha Ailusha's web