 As the first "Siddhar", Agastya is deemed as the first master, accomplished, the sage who perfected his knowledge of the natural and spiritual worlds.This Tamil concept has parallels to Tibetan "mahasiddhas", Sri Lankan Buddhist, and Nath Hindu yogi traditions of north India.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.