 सपत्न्या तु गरस्तस्यै दत्तो गर्भजिघांसया।गरेण सह तेनैव जात स्स सगरोऽभवत्।। 
 With a motive to destroy the embryo her cowife had poisoned her. That child was born with gara or poison for which he was called  Sagara. 