Shaiva in the context of "Atharvashiras Upanishad"

Sēkkilān Mādēvadigal Rāmadēva (12th century CE), known popularly by his family name as Sekkizhar, was a saint and a contemporary of Kulottunga Chola II. He compiled and wrote the Periya Puranam (Great Story or Narrative) in 4253 verses, recounting the life stories of the sixty-three Shaiva Nayanars, the devotees of Shiva. Sekkilhar himself was later canonised and his work, the Periyapuranam became the twelfth and final book of the sacred Saiva canon.

The Kaivalya Upanishad (Sanskrit: कैवल्य उपनिषद्) is a late 1st millennium BCE Sanskrit text and one of the minor Upanishads of Hinduism. It is classified as a Shaiva Upanishad, and survives into modern times in two versions, one attached to the Krishna Yajurveda and other attached to the Atharvaveda. It is, as an Upanishad, a part of the corpus of Vedanta literature collection that presents the philosophical concepts of Hinduism.

The Upanishad extols Shiva, aloneness and renunciation, describes the inner state of man in his personal spiritual journey detached from the world. The text is notable for presenting Shaivism in Vedanta, discussing Atman (Self) and its relation to Brahman, and Self-knowledge as the path to kaivalya (liberation).