The term ‘megalith’ is derived from Greek ‘megas’, which means great and ‘litho’ meaning stone. As the nomenclature suggests, the ‘megaliths’ refer to the monuments built of large stones. But all monuments constructed of big stones are not megaliths. The term has a restricted usage and is applied only to a particular class of monuments or structures, which are built of large stones and have some sepulchral, commemorative or ritualistic association except the hero stones or memorial stones. In other words, the megaliths usually refer to the burials made of large stones in graveyards away from the habitation area. The problem of chronology of these cultures has evaded a clear solution. R.E.M. Wheeler, for the first time, on the basis of excavations at Brahmagiri provided a firm archaeological setting for megalithic cultures in South India. Based on archaeological evidence, he places these cultures between the 3rd c. B.C and the 1st c. A.D.