Agastya, along with Tirumular, is considered a siddhar in both philosophical and practical domains, unlike most other siddhar who are revered for their special domain of knowledge. Agastya is also unique for the reverence he has received in historic texts all over the Indian subcontinent.[55] According to Venkatraman, the Siddhar-related literature about Agastya is late medieval to early modern era. In particular, all medicine and health-related Tamil text, that include Agastya as the Siddhar, have been composed in and after the 15th-century. According to Hartmut Scharfe, the oldest medicine siddhar Tamil text mentioning Agastya were composed no earlier than the 16th century. Pt Rajneesh Sharma ( Chief Nadi Astrologer)