Once Ravana requested Vasishta to teach the Vedas but the latter did not comply. Embittered by this refusal, Ravana captured and imprisoned him, not worried about the repercussions it could create. Kuvalayaswar, a King of Surya Vamsa helped Vasishta by liberating him from Ravana. Infuriated, Vasishta cursed Ravana that he and his genre would be obliterated by the Kings of Surya Vamsa. ( Kamba Ramayanam - Yudhha Kandam ).

Lord Surya had a wife Samgna by name, and through her a son called Yama and a daughter called Yami or Kalindhi were born. Samgna unable to withstand the resplendence of Surya requested her friend Chaya to look after him and left on a pilgrimage. Chaya dressed herself like Samgna and surreptitiously served Surya. In the process Chaya gave birth to Sanaiswaran ( Saneeswaran is not the correct name as he is not Eshwaran. In Sanskrit, Sanaiswaran means 'moving slowly'. Of the nine Grahas he is the slowest, staying for 2 and a half years in each Rasi before moving to the next one) and Thapthi, a daughter.

Samvaranan, a King of Chandra Vamsa, ruled his counry with Vasishta as his Raajaguru. Once he handed over the responsibility of the Kingdom to Vasishta and went to the forest to do penance. As he was riding in a forest , he saw a Deer and started chasing it. He reached a lotus pond where beautiful maidens ( apsaras )were playing near the pond. Surya's daughter Thapthi was also in the group. Both Samvaranan and Thapthi fell in love instantly. As Samvaranan was looking at her with unrestrained passion, he fell off the horse and fainted. Thapthi felt sad and her friends took her back home. Meanwhile the Ghandarvas who were nearby, helped Samvaranan regain consciousness. Samvaranan lovestricken, returned to the Kingdom. But his mind and heart were still with Thapthi, and so suffered from lack of sleep and hunger. Vasishta, who observed the King's state , through his sensory powers ('Gnana Dhrishti'), understood the reason for the King's behaviour. By his Yogashakthi, Vasishta flew to the chariot of Lord Surya and informed him about their love. Surya gave his consent happily and Thapthi with Vasishta. The Sage arranged for their wedding and blessed them.

Lord Surya blessed his daughter and at a later stage turned her into River Narmada - which flows from Vindhya mountains towards the West.