Nathamuni, also known as Sri Ranganathamuni, (823 CE – 951 CE), was a Vaishnava theologian who collected and compiled the Naalayira Divya Prabandham. Considered the first of the Sri Vaishnava acharyas, Nathamuni is also the author of the Yogarahasya, and the Nyayatattva. Birth and family Nathamuni is generally considered to have been born in 823 CE and to have died in 951 CE. His birth name was Aranganathan; however, he was known as Nathamuni or literally the Saint-lord (Nathan - lord, muni - saint) An alternative view is that he was born in 582 CE and died in 922 CE. Yet another view is that Nathamuni was born at Viranarayana Puram sometime shortly after 907 CE and flourished in the 10th century. The traditional view that he lived for than 400 years is untenable. It is likely that Nathamuni lived for slightly over a hundred years in that region controlled by the Chola kings before they rose to the peak of their greatness. His birth star was Anusham. Though there is difficulty in identifying Nathamuni's date of birth and age, he is considered to have lived during the lifetime of Madhurakavi Alvar's parampara (lineage). Vaishnava tradition holds that once, Nathamuni was conversing with his father about the legend of Prabandhams written by the Alvars. His father, Ishvara Bhattar, exclaimed the Prabandhams were long lost, and that they would be impossible to retrieve unless one had the grace of Narayana. Hence, he got interested in this and had set to the pilgrimage to Kumbakonam Sarangapani Temple, where the main deity is worshipped as Aravamudhan. There, he heard priests singing 10 particular pasurams (hymns) dedicated to Aravamudhan (Sarangapani temple's main deity) by Saint Nammalvar. He was overjoyed hearing those and enquired its details. But the priests stated that only 10 pasurams was known to them out of 1,292 written by Nammalvar. He placed immense faith on the Lord Aravamudhan and he visited Thirukurgur, birth place of Madhurakavigal, the disciple of Nammalvar. He enquired about the Prabandhams written by Nammalvar to Madhurakavigal's direct descendants who lived at Thirukurgur. There, the descendants of Madhurakavigal gave 10 pasurams written by Madhurakavigal by the name Kanninun Siruthambu. They also gave information to Nathamuni that, whoever sings these 10 pasurams with dedication, will get contact with Nammalvar himself at Alvarthirunagari, the birth place of the saint himself. But they also questioned him how will he know the