Arulmigu Aiyarappar Temple, also known as Panchanadeeswarar Temple, is a prominent Hindu temple dedicated to Lord Shiva, located in Thiruvaiyaru, Thanjavur district, Tamil Nadu.
The name "Thiruvaiyaru" translates to "Land of Five Rivers," referring to its position near the confluence of five tributaries of the River Kaveri.
The temple is celebrated in the hymns of Thevaram and is classified as a Paadal Petra Sthalam, indicating its importance among Shiva temples.
It is also associated with Saint Thyagaraja, one of the trinity of Carnatic music, who spent a significant part of his life in Thiruvaiyaru..