Valluvan or valluvar is a native caste of Tamilnadu. They were the hereditary priests preaching and practicing astrology, astronomy and medicine. Before the arrival of the Brahmins, they were the hereditary priests of the Pallava rulers. They are the hereditary astrologers of vaithiswaran Koil, a temple town and are experts in Nadi astrology.
In olden days the sages and sears had a deep research about the nature of human beings and their future happenings of the life through the astrological science. They have written their miraculous findings in the Palmyra leaflets. There are lakhs of manuscripts found in such a way.