Periya Purana

The great (Periya) Narrative (Purana) is the life of the 63 Nayanars in poetry, written by Sekkilar, also transliterated Sekkizhar, with 4,286 verses. It is the 12th part of the Tirumurai.

Another name for this Purana is Tiruttontar Purana.

Read Periya Purana here
https://shaivam.org/devotees/periyapuranam-of-sekkizhar-english-translation