This book is an attempt to study the life and work of the Saiva Saint, Appar, also called Thirunavukkarasu, who lived in the 7th century a.d. After spending some years as a Jaina ascetic, under the name Dharmasena, Appar returned to Saivism, his parent faith. Moving on foot from temple to temple, Appar sang the glories of Siva with intense devotion and met in his journey, Saint Jnanasambandar. Both together, spearheaded the great devotional movement, which is a landmark in the history of religious life of the people of India. The poems of the Saint, collected into three books, and known as Tevaram, reflect the great devotional path, followed and enunciated by Appar. Though rooted in Tamil soil, the hymns of Appar are truly Indian in essence and vividly picturise the Vedic and Agamic base of Tamil Saivism rightly known Vaidika Saivam. There is no hymn of the saint, in which the greatness of Vedas and Siva as the embodiment of Vedas, is not reflected.