Kandhaswamy Temple, Cheyyur – Legends
As per Hindu legend, Muruga obtained the Vel (spear) from his mother Parvathi from Sikkal Singaravelan Temple. He slayed Sooran, the demon, the event called Surasamharam at Thiruchendur. During the war, Bhutaganas, Shiva's army, is also believed to have helped Murugan. Since Murugan killed Sooran and his son Iranyeswaran, he attained Dosha (sin).
To propitiate himself from the sin, he is believed to have installed the image of Shiva as Somanatha at this place and worshipped Shiva. Since the son of Shiva (called Sei) worshipped him, the place is called Cheyyur. The 27 Bhutaganas are personified to the 27 stars as per Hindu mythology.