Pasurapadi Ramayanam was compiled by Swami Periyavachan Pillai. He was a stalwart in the Srivaishnava Siddhanta. He was very proficient in Naalayira Divya Prabandham. He took phrases from Azhwars' pasurams and put them together to form a Ramayanam, known as Pasurapadi Ramayanam or Divya Prabandha Ramayanam. This is a very beautiful text and soothing to ears.