New Martyr Mark of Smyrna, beheaded on Chios in 1801 after returning to Christ with repentance.
Saint Mark was born in Smyrna. Tradition relates that after a moral fall he renounced his faith, but soon repented and, after preparing himself in prayer, went to Chios, where he publicly confessed Christ before the Turkish authorities. He was beheaded there on 5 June 1801.
Feast day
On the New Calendar, Mark the New Martyr of Chios is commemorated on June 5. Churches on the Old (Julian) Calendar keep the feast on June 18 of the civil calendar.
Also commemorated on June 5

Ten Martyrs of Egypt
Martyr, Δέκα Μάρτυρες εν Αιγύπτω
Holy Martyrs Marcian, Nicander, Hyperechius, Apollonius, Leonides, Arius, Gorgias, Selenias, Irene and Pambo of Egypt.
Boniface of Germany
Hierarch, Βονιφάτιος ο Γερμανίας
Hieromartyr Boniface, apostle of the Germans, archbishop of Mainz, slain by pagans in Frisia.
Theodore Yaroslavich of Novgorod
Saint, Θεόδωρος ο Δούκας
Righteous Prince Theodore of Novgorod, elder brother of Saint Alexander Nevsky.
Christopher and Conon of Rome
Martyr, Χριστόφορος και Κόνων
Holy Martyrs Christopher and Conon, who suffered for Christ at Rome.