Krishnagiri District has prehistoric importance archaeological sources confirm the presence of habitats of mankind during Paleolithic, Neolithic and Mesolithic Ages. Various rock paintings and rock carvings of Indus Valley civilization and Iron Age seen in this district support the historical significance of this district. The heart of Krishnagiri, Hosur and Uthangarai were known as ‘Eyil Nadu’. ‘Murasu Nadu’ and ‘Kowoor Nadu’ respectively. During Chola period, Krishnagiri region was called ‘Nigarili Chola Mandalam’ and Vidhugadhazhagi Nallur’. Under ‘Nulamba’ rule it was popular as ‘Nulambadi’according to historical sources. Hero Stones were erected for those whose lost their lives in pursuit ui adventure. There was a tradion of erecting memorial stones for people who sacrifice their lives for the sake of their Kings since ‘Sangam Age’. These memorial stones were called ‘Navagandam’. This region was ruled by Pallavas, Gangas, Nulambas, Hoysalas, Vijaya Nagar Emperors. Bijapur Sultans, Wudayars of Mysore and Nayaks of Madurai. This district was bifurcated from Dharmapuri District on 09-02-2004. Krishnagiri is also a historical place. Once a place of importance in the wars, Krishnagiri also possesses a fort. This dilapidated fort, with huge boulders of stupendous size making the walls, reveal it’s glorious past. An old fort called “Syed Padsha Hill Fort” is famous and attracts many tourists apart from the reservoir. The Dam Site is a picnic spot.
The name Hosur in ‘Kanarese’ means ‘new town’. A large fort situated in this town is ascribed to one ‘captain Hamilton and two other prisoners who were compelled by Tippu Sultan to assist in strengthening his foils.
Rajaji Memorial Thorapalli is in memory of the great leader Rajaji. The Tamil Nadu Government has converted the house in Thorapalli where Rajaji was born, as a memorial.
This is 25 Km from Hosur situated near the Karnataka state. The area is coveted by a number of hills. The climate is chill round the year. Ii is called Little England.