Anthony of Supraśl was a Ruthenian monk and martyr who lived during the late 15th and early 16th centuries. Born in the Grand Duchy of Lithuania to an Orthodox family, he sought to atone for a violent incident in his youth by entering the Supraśl Orthodox Monastery. After traveling to Mount Athos to take the Great Schema, he moved to Thessaloniki. There, he faced execution for his public Christian prayers and refusal to convert to Islam, eventually dying as a martyr.