Srimad Bhagavatam Canto 09, Chapter 08, Text 14

SB 9.8.14

yo ’samañjasa ity uktah
 sa kesinya nrpatmajah
tasya putro ’msuman nama
 pitamaha-hite ratah
 
Translation by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada: 
 
Among the sons of Sagara Maharaja was one named Asamañjasa, who was born from the King’s second wife, Kesini. The son of Asamañjasa was known as Amsuman, and he was always engaged in working for the good of Sagara Maharaja, his grandfather.
Srimad Bhagavatam Canto 09, Chapter 08, Text 13
Srimad Bhagavatam Canto 09, Chapter 08, Text 15-16