Sri Agastya (also transliterated as Agathiar, Agasthiar, Agastyar, Agasti, Agastiar) is a legendary Vedic Rishi (sage). It is considered that sage Agastya was instrumental in unfolding the Vedic religion in southern India. Agastya is also accredited as one of Seven Great Sages (Saptarishis).
Sage Agasthiyar has also contributed immensely to the four Vedas in hinduism. These mantras were disclosed to Sage Agasthiyar by the Brahman (Supreme Being) itself. Agastya is also the leader of all Siddhas. He is also called Kurumuni, meaning short (kuru) saint (muni). His contributions are manily in the fields of Medicine (Siddha) and Astrology - particularly Nadi Astrology (Jyotish, Jodhidam, Josyam or Jothisyam).
Maharishi Sri Agastya is said to have lived for over 5000 years on earth & is immortal, and that one of his medicinal preparations, Boopathi Kuligai, is so powerful that it can even bring the dead back to life. Two of his students and disciples were Therayar and Tholkappiar. He is also considered to be the guru of many other Siddhars.