During ancient times, there was a noble sage known as Kauśika (Kaushika). He had seven sons who committed the sin of slaughtering cows and as a result, were born, in their next birth, to a family of hunters. Thereafter, they were born as ruddy geese on the waters of the Mānasa (Manasa) Sarovara. One of these seven ruddy geese was named Aṃśumāna (Angshumana).