Maharishi Agastya was a revered Vedic sage of Hinduism. Agastya is the named author of several hymns of the Rigveda. Maharishi Agastya is mentioned in all the four Vedas, and is a character in the Brahmanas, Aranyakas, Upanishads, Ramayana, Mahabharata and many Puranas. He is the author of hymns 1.165 to 1.191 of the Rigveda. He is more popular with his works 'Agastya Samhita' and 'Naadi Shastra', both the works respectively based on Astronomy and Medicine. It is said that he went to South India upon the direction of Lord Shiva. He is credited with the birth of the Kaveri river. He is credited with teaching Lord Rama the ‘Aditya Hridiyam’. He was married to Lopamudra, a Brahmavadini and a contributor to the Vedas. He is considered a master of both spiritual and material knowledge. He is a great siddha.