There are two important temples at Srimushnam. One of them is called the Adi Vraha or Bhuvaraha temple and the other more important Siva temple is called the Tirumuttam-udaiya Mahadevar or Nityesvarar temple.
The inscriptions at the Nityesvara temple contain cross-references to the Adi Varaha temple. The earliest record of a Chola ruler on the present structure dates to the reign of Kulottunga I (?1070 – 1122 CE). There are also inscriptions relating to the time of Rajaraja III (1216–1246 CE) that record donation of gifts to the temple. On the walls of the enclosure (prakara), there are two records relating to Vikrama Chola (1118 – 1135 CE) and a large number relating to the Vijayanagara rulers.
Reference: S.R. Balasubrahmanyam, 1979, pp. 88-89.
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