Yuvanshva was a king in the Ikshvaku dynasty – the lineage in which Bhagvan Sri Ram appeared. By accident he had become pregnant and delivered a boy who became an illustrious king. The whole incident happened during the Krita Yuga.
King Yuvanshva had no children. Like all kings, he was worried about his subjects and his dynasty. He tried numerous methods to solve the problem. But he was not successful. Disappointed and disgusted, the king left for the forest with his wives.
The sages who resided in the forest came to know about the arrival of the king and met him. They decided to help the king by performing a yajna.
The sages successfully performed the yajna and collected the holy water and placed it in a pot. The sages wanted to give the water to wives of the king next day morning.
During the night, the king felt extremely thirsty and in half sleep drank the holy water without realizing its holiness.
Next day morning the Rishis discovered that the pot to be empty. Soon they discovered what had happened the previous night.
As months passed, stomach of the king became big. Finally, with the help of the sages, the stomach was cut open and a son was born to the king.
The sages saved Yuvanshva and he later performed tapas and attained salvation.
The child that was born was named Mandhatri and became a great king.