"Periya Puranam", the eleventh-century Tamil book on the Nayanars that forms the last volume of the "Tirumurai", primarily had references only to "Tevaram" and subsequently expanded to 12 parts.One of the first anthologies of Sambandar, Appar, and Sundarar's hymns, the "Tevara Arulmuraitirattu", is linked to Tamil Saiva Siddhantha philosophy by grouping ninety-nine verses into 10 categories.