What is "sekkizhar"

Sekkizhar ( Tamil: சேக்கிழார்) was a poet and scholar of Tamil Shaiva Siddhanta, a Saiva saint contemporary with the reign of Kulothunga Chola II. He compiled and wrote the Periya Puranam (Great Purana), 4253 verses long,recounting the life stories of the sixty-three Shaiva Nayanars, the poets of Shiva who composed the liturgical poems of the Tirumurai. Sekkizhar's work itself became part of the sacred canon.