Template:December 18

Martyr Sebastian at Rome and his companions: Martyrs Nicostratus, Zoe, Castorius, Tranquillinus, Marcellinus, Mark, Claudius, Symphorian, Victorinus, Tiburtius, and Castulus; Saint Modestus, Archbishop of Jerusalem (see also December 16); Saint Florus, Bishop of Amisus; Saint Micahel Syngellon the Confessor at Constantinople; Martyr Eubotius at Cyzicus; Saint Sebastian, Abbot of Poshekhonye Monastery (Vologda); Righteous Simeon, Wonder-worker of Verkhoturye; Hieromartyr Zacchaeus the Deacon and Saint Alphaeus the Reader, of Caesarea; Saint Sophia the Wonder-worker; New Hieromartyr Archbishop Thaddeus (Uspensky) of Tver; Venerable Daniel the Hesychast; Saint Winnibald, Abbot of Heidenheim; Saint Flannan, Bishop of Killaloe; Saint Samthann, Abbess of Clonbronney. Other events: dedication of the House of the Theotokos Chalcoprateiois