July 11 (old calendar) / July 24 (new) Greatmartyr Euphemia the All-praised (451). Bl. Olga (in Baptism Elena), Princess of Russia (969). Hieromartyr Cindeus, Presbyter, of Pamphylia (3rd-4th c.). GREATMARTYR EUPHEMIA THE ALL-PRAISED 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