Wikipedia
Nammalvar ( Tamil: Nammāḻvār) is one of the twelve alwar saints of Tamil Nadu, India, who are known for their affiliation to the Vaishnava tradition of Hinduism. The verses of alwars are compiled as Nalayira Divya Prabandham and the 108 temples revered are classified as Divya Desam. Nammalvar is considered the fifth in the line of the twelve alwars. He is highly regarded as a great mystic of the Vaishnava tradition. He is also considered the greatest among the twelve alwars and his contributions amount to 1352 among the 4000 stanzas in the Nalayira Divya Prabandam.
According to traditional scriptures, Nammalwar was born in 3059 BCE in Alwarthirunagiri. In Hindu legend, Nammalwar remained speechless from his birth sitting in a tamarind tree and he first interacted with Madhurakavi Alvar, who saw a bright light shining to the south, and followed it until he reached the tree where the boy was residing.
The works of Nammalwar were compiled by Madhurakavi as four different works, the Tiruvayumoli (1102 verses), Thiruviruttam (100 verses), Thiruvaasiriam (or Thiru Aasiriyam - 7 verses) andPeriya Thiruvanthadi (87 verses). The works of Nammalwar contributed to the philosophical and theological ideas of Vaishnavism. Along with the three Shaiva Nayanars Appar, Sundarar and Sambandar, they influenced the ruling Pallava kings of South India, changing the religious geography from Buddhism and Jainism to Hinduism.
In South Indian Vaishnava temples, Nammalwar is given a status equal to that of Hindu god Vishnu and has images and festivals associated with him. The Garudasevai festival in Nava Tirupathi, the nine Vishnu temples in Thoothukudi region and the Araiyar Sevai during the Vaikunta Ekadesi festival in Srirangam temple are dedicated to him. The verses of Nammalwar and other alwars are recited as a part of daily prayers and during festive occasions in most Vishnu temples in South India.