July 11 Greatmartyr Euphemia the All-praised (451). Bl. Olga (in Baptism Elena), Princess of Russia (969). Hieromartyr Cindeus, Presbyter, of Pamphylia (3rd-4th c.). Saint Euphemia The Miracle of Saint Euphemia the All-Praised: The holy Great Martyr Euphemia (September 16) suffered martyrdom in the city of Chalcedon in the year 304, during the time of the persecution against Christians by the emperor Diocletian (284-305). One and a half centuries later, at