During kirEthaa yugam a King by the name Meganathan had a heroic Son by name Bali. During that time Maali, Maalyavaan and Suumaali, Three daemons, Maali, Maalyavaan and Suumaali, were at war with the Devas. They requested Bali's help which was turned down by Bali. This resulted in their defeat. Hence they surrendered to Bali and pleaded with him to fight the devas on their behalf. Bali obliged and convincingly defeated the Devas.

However, Bali's conscience bothered him and so decided to meditate on Tirumal, the Lord of the Devas, for a long time. Lord Vishnu, pleased with Bali's efforts, satisfied Bali's request for pardon and blessed him in the form of Lord Varaaha Perumal in the Temple tank (hence the name Varaaha Theertham).

About this time there was a Rishi by name Kuni who was meditating by the banks of Saraswati river and reached the heavens while in meditation. His daughter, who wished to follow her father, was stopped by Naradhar, Lord's greatest bhakta. He suggested that it was not her time as she was not yet married. He then requested one of the sages meditating at the banks of Saraswati river to come forward and take her hand in marriage. Kavala rishi immediately obliged and their wedding was conducted by Naradhar himself.

Within a year they had 360 daughters. Having realized that this was possible only by the grace of Lord, Kaalava rishi decided to give all his daughters in marriage to Lord Himself. When the 360 daughters grew up to the marriage age, the rishi was getting worried about their future. At the same time, some pilgrims who had reached the banks of Saraswati river, after a long journey from South, learned about Kaalava rishi's worriess. They approached him and advised him to go to Vamakavipuri and obtain the blessing of Lord Varaaha, who was known for his generosity and kindness. They also reminded him that only Lord Vishnu can help him solve his dauhgters marriage problem.

Kaalava Rishi immediately relocated and started his meditation on Lord Varaaha. Lord Narayana, took the form of a Brahmachari and informed the rishi that he came to the Divya Desam on Yaathra. The rishi explained his situation and requested the Brahmachari to give up his brahmachari yaathra by marrying his daughters.

The Brahmachari obliged and married one daughter each day (hence the name Nitya Kalyaana Perumal ). On the last day, while every one was watching, the Lord (appearing as Varaaha Perumal) merged all 360 daughters into one Sri and hoisted Her on His left thigh (hence the name Tiru + ida + enthai ). Since Sri on His thigh became the combined form of 360 Kannis, She came to be known as Akila valli Naacciyaar.








Source:
1. 108 Vainava Divya Desa VaralaaRu by A. Ethirajan
2. Thondai Naattuth thiruth thalaNGaL by Sri M. A. Venkata Krishnana (Geethaa chaaryan).