Apatsahayesvarar Temple, Alangudi or Guru Sthalam or Tiru Irum Poolai[1] is a Hindu temple dedicated to Shiva located in the Needamangalam Town near village of Alangudi in the Valangaiman taluk[2] of Tiruvarur district, Tamil Nadu, India.
Shiva is worshipped as Apathsahyesvarar, and is represented by the lingam. His consort Parvati is depicted as Elavarkuzhali. The presiding deity is revered in the 7th-century Tamil Saiva canonical work, the Tevaram, written by Tamil saint poets known as the Nayanmars and classified as Paadal Petra Sthalam.
The temple complex covers two acres and it houses a five tier gateway tower known as gopurams, one facing the Apathsaheswarar shrine and other towards North. The temple has a number of shrines, with those of Apathsaheswarar and his consort Elavarkuzhali being the most prominent.
The temple has six daily rituals at various times from 6:00 a.m. to 8:30 p.m., and four yearly festivals on its calendar. The Brahmotsavam festival celebrated during Chittirai (April–May) is the most prominent festival.