What is "agathiyar"

for 1972 film based on his history, see Agastya Agathiyar is a 1972 Indian Tamil mythological film written, directed, and produced by A. P. Nagarajan under production company Sree Vijayalakshmi Pictures. The soundtrack was composed by Kunnakudi Vaidyanathan. The film stars Sirkazhi Govindarajan playing main characters with T. R. Mahalingam, A. V. M. Rajan, Kumari Padmini, R. S. Manohar, Suruli Rajan, Manorama and Sridevi portrayed supporting roles. This film ran for 100 days and won widespread appreciation. The film was dubbed into Hindi under title Maharish in year 1986.