 सपत्न्या तु गरस्तस्यै दत्तो गर्भजिघांसया।सह तेन गरेणैव जात: स सगरोऽभवत्।। 
 Since poison was given to her by  her rival queen with the intention of destroying the   embryo, the son was born with poison and so came to be known as Sagara. 