Vaivasvat was the seventh Manu according to Indian mythological stories.
Since he had no son, the sage Vashishtha caused a sacrifice to be performed by him. Manu's consort, Shraddha, wished to have a daughter and accordingly requested the sacrificial priest (Hota) to get her a daughter. The priest offered oblations with that motive and as a result of this a daughter was born to Shraddha. The baby was named Ila. Vaivasvat was taken aback to hear of this change and approached the sage with his grievance. Vashishtha, who came to know the cause through meditation, consoled the Manu and assured him that he would fulfill his desire by dint of his penance. He prayed to the Lord and propitiated Him and secured a blessing from Him to the effect that the king's daughter would be transformed into a son. Ila was accordingly changed into Sudyumna.
One day, Sudyumna, who was now grown up into full manhood and was out for hunting, entered the precincts of a pleasure-grove at the foot of Mount Sumeru, reserved for Lord Shiv and goddess Parvati, and was retransformed into a woman under a standing curse pronounced by Shiv that any male who entered the grove would be changed into a woman. Chandrama's son, Budh, who had been practicing austerity in the vicinity of that grove fell in love with the woman and she too was attracted towards him. The pair accordingly lived together as husband and wife. One day the princess invoked Vashishtha, who appeared before her and was moved with pity to see her plight. He prayed to Lord Shiv and secured from him a boon to the effect that the prince would change his sex every month. He thus lived with Budh as his wife for one month and ruled over his kingdom as Sudyumna during another by rotation.
Since he had no son, the sage Vashishtha caused a sacrifice to be performed by him. Manu's consort, Shraddha, wished to have a daughter and accordingly requested the sacrificial priest (Hota) to get her a daughter. The priest offered oblations with that motive and as a result of this a daughter was born to Shraddha. The baby was named Ila. Vaivasvat was taken aback to hear of this change and approached the sage with his grievance. Vashishtha, who came to know the cause through meditation, consoled the Manu and assured him that he would fulfill his desire by dint of his penance. He prayed to the Lord and propitiated Him and secured a blessing from Him to the effect that the king's daughter would be transformed into a son. Ila was accordingly changed into Sudyumna.
One day, Sudyumna, who was now grown up into full manhood and was out for hunting, entered the precincts of a pleasure-grove at the foot of Mount Sumeru, reserved for Lord Shiv and goddess Parvati, and was retransformed into a woman under a standing curse pronounced by Shiv that any male who entered the grove would be changed into a woman. Chandrama's son, Budh, who had been practicing austerity in the vicinity of that grove fell in love with the woman and she too was attracted towards him. The pair accordingly lived together as husband and wife. One day the princess invoked Vashishtha, who appeared before her and was moved with pity to see her plight. He prayed to Lord Shiv and secured from him a boon to the effect that the prince would change his sex every month. He thus lived with Budh as his wife for one month and ruled over his kingdom as Sudyumna during another by rotation.