What is "sundarar"

Sundarar ( Tamil Cundarar), also known affectionately as Tampiran Tōḻan (Comrade of the Master, meaning Shiva) was an eighth-century poet who was one of the most prominent Nayanars, the Shaiva bhakti (devotional) poets of Tamil Nadu. He was a contemporary of Cheraman Perumal and Kotpuli Nayanar who also figure in the 63 Nayanmars. The songs of praise are called Thiruthondathogai and is the original nucleus around which the Periyapuranam is based. The Periya Puranam, which collects the legends of the Nayanars, starts and ends with him. The hymns of seventh volume of the Tirumurai, the twelve-volume compendium of the poetry of Tamil Shaiva Siddhanta, were composed by him.