Erasmus of Formiae was a 4th-century Christian bishop and martyr born in Antioch. Serving as the Bishop of Formia, he reportedly fled to Mount Lebanon to avoid the persecutions led by emperors Diocletian and Maximian. His life is characterized by various legendary accounts, including a period of hiding and subsequent encounters with Roman authorities. He is widely recognized as a saint in the Catholic, Anglican, and Orthodox traditions, particularly noted for his role as a martyr during the Diocletianic Persecution.