Sri Nandi Devar - Sri Nandi Devar is one of the foremost of the 18 yoga siddhas. He has been directly initiated by Lord Shiva himself and some of his contributions include medicine, kaya kalpa & Alchemy. Some of his eminent disciples are Thirumoolar, Patanjali, Dakshinamoorthy, Romarishi (Kayilay Kambilisattamuni) & Sattaimuni.