Agastya

Agastya is one of the ancient saptarshis, a revered Vedic sage, and the earliest Siddhar. He is also believed to be the author of Agastya Samhita. The word is also written as Agasti and Agathiyar (Tamil: அகத்தியர் Agathiyar;Telugu: అగస్త్య; Kannada: ಅಗಸ್ತ್ಯ; Malayalam: അഗസ്ത്യന്‍ or അഗസ്ത്യമുനി; Sanskrit: अगस्त्य; Malay: Anggasta; Thai: Akkhot). Agathiyar(அகத்தியர்) in Thamizh means one who is focussed inward அகம் - அகத்து + இயர் = அகத்தியர் A-ga in Sanskrit means a mountain, and Asti means thrower. Agastya is also the Indian astronomical name of the star of Canopus, is said to be the 'cleanser of waters', since its rising coincides with the calming of the waters of the Indian Ocean. He was son of Pulasthya, son of Brahma.

Siddhar were spiritual adepts who possessed the ashta siddhis, or the eight supernatural powers. Sage Agathiyar is considered the guru of all Siddhars, and the Siddha medicine system is believed to have been handed over to him by Lord Muruga, son of the Hindu God Lord Shiva and goddess Parvathi. Siddhars are the followers of Lord Shiva. Agathiyar is the first Siddhar. His disciples and other siddhars contributed thousands of texts on Siddhar literature, including medicine and form the propounders of the system in this world. He is considered as the Father of Tamil literature and compiled the first Tamil grammar called Agathiyam. Adhithya Hrudhayam was revealed by Agathiar. Rama was finding it difficult to defeat Ravana, Agathiyar coming to Rama's help gave him "Adhithya Hrudhayam" after which Rama defeated Ravana. He is regarded to have lived around 15000 BCE. It is a mythological estimate.