Fountainhead of Saiva Siddhanta

The Tirumantiram, literally "Holy incantation," is the Nandinatha Sampradaya's oldest Tamil scripture, written ca 200 bce by Rishi Tirumular. It is the earliest of the Tirumurai, and a vast storehouse of esoteric yogic and tantric knowledge. It contains the mystical essence of raja yoga and siddha yoga, and the fundamental doctrines of the 28 Saiva Siddhanta Agamas.