Kolar district is a district in Karnataka state of India. The town of Kolar is the district headquarters. Kolar district is located in the southern region of the State and is the eastern-most district of the Karnataka State. The district is bounded by the Bangalore Rural district in the west Chikballapur district in the north, Chittoor District of Andhra Pradesh in the east and on the south by Krishnagiri and Vellore district of Tamil Nadu.
Formerly, Kolar was known variously as Kolahala, Kuvalala and Kolala. Kolar was called Kolahalapura during the Middle Ages, but later came to be known as Kolar. It was the battlefield for the warring kingdoms of Chalukyas in the north and Cholas to the south. It was the capital of the Gangas until 4th century AD when they shifted the capital to Talakad in Mysore. In 1004 AD, the Cholas annexed Kolar until 1116 AD,. Vishnuvardhana (1108-1142 AD) freed Gangavadi from the Cholas, and in commemoration of his victory, built the celebrated Vijayanarayana Temple (Chennakesava Temple) at Belur.
The major and important temples in the town are Kolaramma Temple and Someshwara Temple. The Kolaramma temple is of Dravida Vimana style built in Ganga tradition in the 2nd century CE and dedicated to goddess Shakti. The temple was later renovated during the period of the Chola monarch Rajendra Chola I in the 10th century and Vijayanagara kings in the 15th century.Someswara Temple is a fine example of 14th century Vijayanagara art.