Was there an Academy in the Ancient Tamil Country?

Tamil literature talk of three Sangams,Academies in the pre-historic past which were established to study and cultivate Tamil language.However some doubt the existence of these academies and consider literary evidences as inflated glory.The author approaches the subject without any pre-conceived notions and brings out his points of view.Similarly the personage of Agattiyan is put to test -if he really were there in the Tamil country or if he were a myth created to glorify the the Indo-Aryans a role in the creation of Tamil Language. Tolkappiyam the earliest grammar book of the Tamils evokes a mixed reaction from scholars for its date.The author fixes its date. The conclusions arrived at by the author would spur further discussions on these topics.