Thiruvanaikoil is also called as 'Jambukeswaram' and the Lord as Jambukeswara, Jambunathan and Jambulingam. The myth behind this is, there was a Sage by name 'Jambu Munivar' (munivar – sage). He once got a rare and sacred 'Venn Naaval' (Venn – White, White variety if Naaval fruit) fruit and he offered that fruit to Lord Siva. The Lord after eating the fruit spitted the seed. Jambu Munivar took and swallowed the seed, as it is sacred as the seed came from the Lord’s mouth. Immediately a 'Naaval' tree began to grow in the Saint's head. The Saint prayed to Lord Siva that He should take his abode under that tree. Lord accepted and asked him to continue his penance in the forest on the banks of river Cauvery and said that he will one day come there and abode under that tree.
After many years Devi Akilandeswari worshiped Lord Shiva under that tree during her penance. Thus as he took adobe under the tree on Jambu Munivar he was called as 'Jambukeshwara' and the place is called as 'Jambukeshwaram'. Also thus the 'Venn Naaval' became the 'Sthala Vriksham' (Temple’s Sacred tree). The Shiva Lingam is placed under the Venn naaval tree in this temple. Even today you can see that Venn Naaval tree at the temple, which is said to be many hundred years old.
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