Janaka, king of Mithila, was an ideal ruler. He was a much respected friend of Dasaratha. He was a brave king who was well-versed in the Sastras and Vedas.
Desirous of performing a yaga, Janaka at one time ploughed the chosen site. As was the custom, he ploughed the land himself. As the field was being cleared and leveled, Janaka saw among the shrubs a divinely beautiful baby. Janaka was childless and accepted the infant as the goddess Earth's gift to him.
Taking the child in his arms he went to his beloved wife and said: "Here is treasure for us. I found this child on the yaga site and we shall make it our own." And she joyfully consented and named the child Sita.