Saint Probus was the son of Saint Gaius, and suffered for Christ during the persecution under the emperor Maximian (286-310).
Saint Eustochius was a pagan priest, but seeing the unyielding courage of the Christian martyrs, and the miracles worked by them, he converted to Christ. He went to Bishop Eudoxius of Antioch, was baptized by him, and was ordained to the priesthood. In the city of Lystra Saint Eustochius converted his nephew Gaius and all his household, among which included the children Probus, Lollia and Urban. Soldiers of the emperor arrested Saint Eustochius and took him for trial, but tortures could not turn Eustochius from his faith. They then sent the saint to the governor Agrippinus in the Galatian city of Ancyra. The newly-converted Gaius was also sent with him with his household. All of them, even the women and children, underwent fierce torture, but the martyrs did not deny Christ and so were beheaded.