Janaka, father of Mata Sita and who is known for his philosophical discussions, was not from womb. His name is associated with Mithila and Vaideha. It is said that the great sages of the ancient world churned the body of King Nimi and from it came out a boy.
He was Janaka, called Vaideha (born of the body-less), a he was born from the King Nimi, who other name was Videha.
As he was churned out (mathanj jatah) he was also called Mithila. He founded the city of Mithila.
Mata Sita, incarnation of Goddess Lakshmi, was found by King Janaka.