The Parthasarathy Swamy Temple is one of the 108 Divya Desams, is said to have been renovated by a King of Pallava dynasty.
According to Brahmanda Puranam, the five Deities in the temple are said to have been worshipped by the Saptah Rishis viz. Bhrigu, Manchi, Atri, Markandeya, Sumathi, Saptharoma and Jabali and also have been praised by two of the earliest Alwars viz. Thirumazhisai Alwar, Peyalwar and later on by Thirumangai mannan or Kaliyan, who is considered to be the last of the Alwars chronologically and his year of birth would appear to be 476 A.D. according to the era of Salivahana Saka.

The presiding Deity of this temple Sri Venkatakrishna Swami also known as "GEETHACHARYA". According to Brahmanda purana, King Sumathy prayed Lord Thiruvengada of the Seven Hills to give him darshan in the form of the Charioteer (SARATHY) to PARTHA during the MAHABHARATHA WAR and rendering GEETHA. Lord Thiruvengada appeared in his dream and bade him to go to "BRINDARANYA" where he would give him Darshan in the form he wished. Meanwhile, Athreya Maharishi requested his Acharya Vedavyasa to mention to him the place fit for doing Thapas and he was directed by his Acharya to go to Brindaranya on the banks of the Kairavani Theertham overgrown with Thulasi plants and where king Sumathy was doing Thapas. Saying so, Vedavyasa gave Athreya a Divya-Mangala Vigraha with a conch in his right hand and Gnana Mudra in the left hand pointing to HIS HOLY FEET signifying the famous Charama Sloka of the Bhagavat Geetha:-

"Sarva Dharman Parithyajya Mamekam Saranam Vraja Ahamthwa Sarwa Papebhyo Mokshayishyami Ma Suchaha" (18-66):

This quintessence of the Geetha is rendered into English by Sir Edwin Amold thus:-

“And let go those Rites and writ duties! Fly to Me alone!
Make Me thy single refuge! I will free Thy soul from all its sins! Be of good cheer!”

Accordingly, Athreya Maharishi reached the Ashramam of Sumathy and narrated to him in detail, the circumstances that led him to go there. Sumathy was pleased with the Divya Mangala image of Sri Parthasarathy Swamy in accordance with the desire and welcomed Athreya. He celebrated the Chaitrotsavam according to Vaikanasa Agama and worshipped him. The central figure enshrined in the sanctum sanctorum is being worsipped as "SRI VENKATAKRISHNA SWAMY". Sri Rukmani Thayar and Satyaki, his younger brother, are installed on his right and left side respectively. His elder brother Balarama is seen on the right side of Rukmani Thayar facing north and his son Prathyumnan and his grandson Anirudhan are seen on the northern side of the Garbagraha facing south. These five warriors (Pancha Veeral) are so placed in these positions as we now worship them to keep in conformity with some incidents that took place in their life-time. Still more grandeur and inspiring is the bewitching and ever smiling UTHSAVAR Deity – Sri Parthasarathy Swami, with marks in the face caused by Bheeshma's arrows during the Maha Bharatha War. The Thilagam set with diamonds with a Safire in the centre resembles the full moon in the crystal clear blue sky.

Another special feature of this deity is that this is the only place where Lord Krishna appears with a mustache and without his main weapon Sudarsana Chakra.
At the beginning of the war he vowed not to carry any weapons, so he carried only the association that would announce the beginning and end of the war.
Here Utsava Murthy is shown with a scepter without his story weapon.