Thirumular — Tamil Siddhar

Thirumular stands as the towering bridge between the yogic siddha tradition and Tamil Shaiva Siddhanta theology. According to legend, he was originally a Himalayan yogi named Sundaranathar, a disciple of Nandi Deva along with eight other siddhas including Patanjali and Vyaghrapada. Wandering south, he encountered the lifeless body of a cowherd named Mulan in a field near Chidambaram. Out of compassion for the grieving cows, he entered the corpse using his yogic power of parakaya pravesham, and finding the villagers unwilling to return his own abandoned body, he chose to remain in Mulan's form, thereafter known as Thirumular. He seated himself beneath a banyan tree at Thiruvavaduthurai and, tradition says, uttered only one verse each year for three thousand years, ultimately composing the Thirumandiram, a work of about three thousand verses that forms the tenth Tirumurai of Shaiva canon. His teaching unified raja yoga, siddha alchemy, temple worship, and jnana into a single seamless vision, famously declaring that 'the body is the temple of the soul' and that love (anbu) and Shiva are one and the same. He is revered as the first to systematize the philosophy of Shaiva Siddhanta in Tamil, articulating the categories of pati, pasu, and pasa, and describing the subtle physiology of nadis, chakras, and kundalini centuries before such ideas became widespread. His synthesis of yogic embodiment with devotional surrender remains the philosophical bedrock for every siddhar who followed him.

Thirumular is considered the fountainhead of Siddha medical philosophy because the Thirumandiram contains the earliest Tamil descriptions of the subtle body, prana vayus, and the concept of kaya kalpa, the rejuvenation of the physical body to support prolonged yogic life. He taught that the body must be preserved and perfected rather than renounced, since it is the very instrument of liberation. His verses on the nine gates, the seven dhatus, and the transformation of seminal essence (bindu) into ojas influenced later alchemical siddhas who developed muppu and rasavadam. He is credited with linking pranayama and mantra to physiological longevity, establishing the doctrine that a siddha must attain deathlessness of the body before attaining deathlessness of the soul.