Once, the Ayodhya king Dhriva sandhi had two wives known as Manorama and Lilavathi. They have son named Sudarsana (from Manorama) and Satrijith (from Lilavathi). Both sons were getting their education very well. One day, the king Dhriva sandhi went to hunt and killed by a lion.
The minister of the king had decided to make next to Sudarsana but the second wife of the king had opposed it. Yathajith (father of Lilavathi) made a plan to kill Sudarsana and Manorama got afraid. And she left the kingdom with her son and went to the saint Bharadwaja at Trikutaadri in order to save her child.
Once, Sudarsana was playing with his friends and heard Kleeba word (means impotent). After some days he forgot the actual word and uttered Kleem always. Saint noticed that educated him to worship, the Vaishnavi (Goddess reverenced by Kama beejakshara).
He started to worship the Goddess Vaishnavi and once She came in front of him. She was happy with him and given a spiritual Bow and arrows to always win in the battle field.
Sasikala (daughter of the king of Kashi, Subahu) was fallen in love with the Sudarsana as she heard more about him. One night, Mata Vaishnavi came in the dream of her and told to marry with the Sudarsana. Sudarsana went to the Swayamvara of Sasikala with his mother.
Satrijith was also there in the Swayamvara with his grandfather in law; Yathajith. He announced and warned Sasikala that she should select Satrijith as her husband otherwise he will kill both. Father of Sasikala was very afraid and tried to agree her daughter to marry with Satrijith. But she denied and told her father that Mata Vaishnavi would protect them.
Subahu married his daughter with the Sudarsana on that night. By hearing this event, Yathajith came with his army at the border of Kasi to fight with Sudarsana. A serious battle had started between them, then Goddess Durga become visible in front of them in the sky and killed both (Yathajith and Satrijith).
The whole army got afraid and went away from the battle field. In this way Sudarsana got victory on the battle. By knowing all this, Subahu also became devotee of the Goddess Vaishnavi and worship too much of Her. Goddess Vaishnavi became happy to him and asked him to get any boon from her.
Subahu prayed Her to reside in Kashi and defend them. Goddess Vaishnavi accepted and reside on the bank of Durga kundam, where Subahu constructed a temple. After victory Sudarsana went to the Ayodhya and started ruling Ayodhya.