St. Eustachius called by the Greeks Eustachius, and before his conversion named Placidus, was a nobleman who suffered martyrdom at Rome, about the reign of Adrian together with his wife Theopista, called before her baptism Tatiana, and two sons Agapius and Theopistus. These Greek names they must have taken after their conversion to the faith. The ancient sacramentaries mention in the prayer...