Agattiyam
Agattiyam (), also spelled as Akattiyam, according to Tamil tradition, was the earliest book on Tamil grammar. It is a non-extant text, traditionally believed to have been compiled and taught in the First Sangam, by Agattiar (Agastya) to twelve students. A few surviving verses of Akattiyam are said to be quoted in medieval commentaries. Sage Agattiyar (Agastya), in medieval commentaries of Tamil Hindu scholars, is variously credited with either creating the Tamil language or learning it from the god Siva. In contrast, according to medieval era Tamil Buddhist scholars, the sage learned Tamil from Avalokita. These legends are mentioned in Akitti Jataka and in Tamil Buddhist epics. There is no direct mention of the sage's name, or Agattiyam text, in Tolkappiyam or the bardic poetry of the Sangam literature. Tolkappiyar (epithet), the author of Tolkappiyam, which is the oldest extant Tamil grammar, is believed by various traditions to be one of the twelve disciples of Agattiyar. Tolkappiyar is believed to have lived during the Second Sangam and to be the author of the Tolkappiyam that has survived. The context of the Agattiyam is in the sangam legend. Sangam literally means "gathering, meeting, fraternity, academy". According to David Dean Shulman –