Aranmula Parthasarathy Temple is spread over large area on the banks of river Pamba. It is said that the THIRUVABHARANAM (jewellery) of Lord Ayyappan are taken into procession to sabarimala each year from Pandalam, where this temple comes on the way. Also the THANKA ANKI- a golden attire worn by Lord Sree Ayyappan, is kept here, and taken to Sabarimala during the Mandala season.
This temple is out of 5 temples built by the Pandava brothers in Chengannur. The five temples are Thrichittatt Maha Vishnu Temple built by Yudhishthira, Puliyur Mahavishnu Temple built by Bheema, Aranmula built by Arjuna, Thiruvanvandoor Mahavishnu Temple built by Nakula and Thrikodithanam Mahavishnu Temple built by Sahadeva.
After leaving their capital city, Hastinapur for pilgrimage, the Pandavas arrived at the banks of River Pampa. These temples were built at that time. Every temple has an image of Lord Krishna.