The lord here facing the Cauvery River received his name Asaladeepeswarar Mohanur because of the unflickering flame of the perpetual lamp burning in the sanctum sanctorum. We observed the flame burning steadily without a flicker. Once when the Devas went to see Lord Shiva at Mount Kailash and noticed that he was doing penance alone without Ganga Devi on his head. Lord Muruga to whom the devas asked the reason went in search of her and reached the Cauvery River here. Tired and disappointed, he relaxed and performed penance towards Ganga Devi to locate her. Mother Ganga appeared before him and at the sight of Lord Muruga as her son, she secreted milk that mixed with the Cauvery here at Asaladeepeswarar Mohanur. She blessed Muruga and told him that the spot in the Vilwa forest on the banks of the Cauvery where he did penance will become a holy spot. Lord Shiva with his consort Parvati appeared in front of them and Ganga merged with Parvati to confirm that she is but a part of Goddess Parvati. Magan means Son in Tamil and the name of the place was originally Maganur and transitioned to Mohanur voer time. Another legend for the name is that Goddess Parvati first met an angry Muruga, who had walked out from Mount Kailash and was on his way to Palani Hill, here at Asaladeepeswarar Mohanur and thus the name of the place became Maganur, later Mohanur.