Tiruchirappalli Rockfort is a historic fortification and temple complex built on an ancient rock. It is located in the city of Tiruchirappalli, Tamil Nadu, India. It is constructed on a 83 metres (272 ft) high rock. that may date to over one billion years ago. There are two Hindu temples inside, the Ucchi Pillayar Temple, Rockfort and the Thayumanaswami Temple, Rockfort. Other local tourist attractions include the famous Pallava-era Ganesha temple and the Madurai Nayak-era fort. The fort complex has witnessed fierce battles between the Madurai Nayakas and Adil Shahi dynasty of Bijapur, Carnatic region and Maratha Imperial forces. The fort played an important part during the Carnatic Wars, helping lay the foundations of the British Empire in India. The Rockfort is the most prominent landmark of the city. There are two rock cut temples in the fort, one in the lower part of the fort called Lower Cave temple and other in the complex outside the Thayumanswamny on the way up to Uchi Pillayar Kovil, called the Upper Cave temple. An archaeological study in 2010 revealed that the layout of the rock-cut caves in the temple is similar to that of other rock-cut temples such as the Pundarikakshan Perumal Temple at Thiruvellarai and Pechipalai cave temple. The unfinished caves in the temple, along with the lower cave temples in Thiruvellarari and Tirupparankunram, each have a shrine for Shiva in the east and Vishnu in the west, separated by a central bay between them. The study also revealed that the Lower Cave temple along with Kudumiyan Malai temple exhibited unique form of pillars, which are otherwise not seen in other temples in Tamil Nadu.