May 13 - Eastern Orthodox Church calendar - May 15
Byzantine Pilgrim Stamp of Saint Isidore (6th century).
Translation of the relics of St. Isidore to Venice (Mosaic, St. Isidore chapel, in the Basilica of San Marco).
St. Boniface of Tarsus (Bonifatius).
St. Hallvard, patron saint of Oslo.
May 12 - Eastern Orthodox Church calendar - May 14
May 14 (Eastern Orthodox liturgics)
…May 13 - Eastern Orthodox Church calendar - May 15 All fixed commemorations below celebrated on May 27 by Orthodox Churches on the Old Calendar…
St. George the Hagiorite.
Martyr Alexander of Rome.