Kalyandurg is a town in Anantapur district of the Indian state of Andhra Pradesh. It is the headquarters for Kalyandurg mandal and Kalyandurg revenue division. The discovery of diamond-bearing Kimberlites in Kalyandurg area, is one of the clusters that has been discovered. Boya Palegars ruled important forts of Kalyandurg and rayadurgam. The name of Kalyandurg was derived from the name of a Polygar of 16th Century known as Kalyanappa. Kalyandurgam was under the rule of Sri Krishnadevaraya and was a part of Vijayanagara Empire. Kalyandurg was a taluk of Anantapur district in Madras province which was earlier a part of Dharmavaram that was separated in 1893. Sri Subrahmanyeswara Swamy temple is located at the heart of the town. This temple was built in around 16th century. Anantapur district is replete with Megalithic remains. In the vicinity of Kalyanadurg, several hundred megalithic monuments, such as dolemnoid cists and cairn circles are situated at the foothills and the slopes of the Akkamma Vari hills. Another large group of cairn circles is 2 km north of Akkamma Gari Konda. Similar remains are located at Mudigallu, a village about 5 km easterly to Kalyandurg, and Muthalabanda village, 2 km north east of town, and Gallaplli situated towards Rayadurgam.