The Divya Prabandham is the Divine collection of 4000 hymns sung by Azhvars who lived in the southern part of India before 8th century A.D.The term azhvar means the one who is "immersed in" and they were immersed in Bhagavath anubavam all the time. It was the scholar-saint Nathamuni who, in the 10th century, retrieved and compiled this divine collection and numerous commentries have been written by various poorvacharyas for this divya prabandham and it is a life time exercise to read and the understand the inner meanings of the bakthi laden pasurams.

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http://www.prapatti.com/slokas/tamil/naalaayiram/periyaazvaar/periyaazvaartirumozi.pdf