Theophilus of Adana was a sixth-century cleric from the Byzantine Empire who served as an archdeacon in Cilicia. According to historical accounts, he sought to secure an ecclesiastical position through a pact with the devil after losing his status. His narrative is recognized as one of the earliest accounts of a deal with Satan, serving as a precursor to the Faustian legend. He is remembered for his eventual repentance and his devotion to the Virgin Mary, which led to his spiritual liberation.