Ati Konanayakar or Aathi Koneswaram (Tamil ஆதிகோணநாயகர் கோயில் அல்லது ஆதிகோணேஸ்வரம்) is a regionally important Hindu temple in Tampalakamam village in the Trincomalee District of Sri Lanka.

The presiding deity is Siva but there are important cults associated with the veneration of Pattini Amman and Kathirkamaswami accommodated within the main premises as well.

The temple celebrates daily services stipulated according to Agamic scriptures along with an elaborate annual festival that involves Tamil Hindus living in the general area of Trincomalee district.

[6] According to the Tirukonasal Puranam, Rajasingha II directed the local feudal lords to maintain the temple and its administration.

[7] Residents of Tampalakamam Patuu made requests to the Dutch colonials to follow the traditions of allocating a portion of the revenue generated from paddy cultivation of rice to the maintenance of the temple.

This includes the association of Hindus from various parts of Trincomalee district its festival organization to the assimilation of all local non-Saiva cults within the temple premises.

During the Kandyan and later Dutch colonial period the Tamapalakamam temple also enjoyed revenue from the land that was given to it via royal endowments.

The temple, which is of stone construction is surrounded by a circumambulatory enclosed by a brick wall beyond which there is an outer street.

Worship is conducted three times daily and on special occasions such as Thaipongal, Thaipusam and Tamil New Year day.

[10] The temple also assimilates the cult of Pattini, a local mother goddess who is also popular amongst the majority Sinhalese population of the rest of the island nation as well.

He is the lord of the temple located in Kataragama and is venerated by both Sinhalese and Tamils of Sri Lanka as a form of Murugan.

According to tradition, this festival was organized during legendary king Kullakottan in the original Koneswaram temple and was directed at the Kantalai Tank.

During the festival local agriculturalists would congregate at the Kantalai Tank and offer boiled rice along with areca nut and betel leaves to the idols.