The third of well-known Shams of the history of Islamic Mysticism…Şemseddin Sivâsî, one of the most important scholars of XVIth century, the fruitful author of many verses written in poetic and prosaic styles and also a founder sufi, who established Shamsiyya -the branch of Khalwatiyyah. Having devoted his life to people to please Allah, he was an absolute mentor, who guided people spiritually with his writings, preaches and advices. He was a dignified personality, who enlightened Sivas like a sun with his preaches he made at Sivas Meydan Mosque for years; he immortalized his light with his exemplary life and his works. In his preaches Şemseddin Sivasî always warned people around him about the deceptive earthly temptations and games of nafs and invited them in belief in oneness. With his poems He identified himself as a propeller, called on souls to revolve around their Shams in order to burn their nafs away with the flame of truth.