The fort was built in stages between the 11th and 13th centuries by the dynastic rulers of the region including the Chalukyas and Hoysalas, later the Nayakas of Chitradurga of the Vijayanagar Empire. The Nayakas of Chitradurga, or Palegar Nayakas, were most responsible for the expansion of the fort between the 15th and 18th centuries. The fort was taken over for a short while by Hyder Ali at Chitradurga in 1779. The fort was captured by the British forces twenty years later, when they defeated his son Tipu Sultan. The fort is built in a series of seven concentric fortification walls
Grevillea robusta, commonly known as the southern silky oak, silk oak or silky oak, or Australian silver oak, is the largest species in the genus Grevillea of the family Proteaceae. It is not closely related to the true oaks, Quercus. It is a native of eastern coastal Australia, in riverine, subtropical and dry rainforest environments receiving more than 1,000 mm per year of average rainfall.