Sri Pothuluri Veerabrahmam & Brahmamgaru was a Hindu sage and oracle. He is considered to be the author of Kalagnanam, a book of predictions about the future. His prophetic texts are also known as the Govinda Vakyas.
Ravvala konda caves...
Bramhendra swamy writes future incidents (kala jnanam) writes hear in 1600 century.