"Divya Suri Saritra" by Garuda-Vahana Pandita (11th century AD), "Guruparamparaprabavam" by Pinbaragiya Perumal Jiyar, "Periya tiru mudi adaivu" by Anbillai Kandadiappan, "Yatindra Pranava Prabavam" by Pillai Lokacharya, commentaries on "Divya Prabandam", Guru Parampara (lineage of Gurus) texts, temple records and inscriptions give a detailed account of the "azhwars" and their works.