The celebrated Mahadeva Temple at Kottayam, on the Thiruvakkara Hill at the very center of the Kottayam Municipal town is one of the important Siva temples, Famous for its historical importance, antiquity, and sanctity. The grandest festival of this temple is the "Arattu Utsavam" lasting for ten days from the 1st Meenam (March-April) which is attended by hundreds of thousands of people, irrespective of caste or creed.