Who was/were the 10th century composer(s) of the Nalayira Divya Prabandham?

The Nalayira Divya Prabandham is a collection of 4,000 Tamil verses composed by the 12 Alvars and was compiled in its present form by Nathamunigal during the 9th -10th centuries. These were sung by the Alwars indevotional estacy in varrious shirineas of Vishnu, made famous as Magalashasana sthalas.