 Little is known about Sadaiya Nayanar.The Tamil "Periya Puranam" by Sekkizhar (12th century), which is the hagiography of the 63 Nayanars and the primary source about their life, dedicates just a hymn to him, naming his son Sundarar and wife Isaignaniyar.Besides being mentioned in his own one-verse chapter in Sekkizhar's hagiography, Sadaiya Nayanar also appears in the main chapter of the text, which narrates the legend of his son Sundarar, who is regarded as the hero of the "Periya Puranam".