August 31 (Eastern Orthodox liturgics)
- Eastern Orthodox liturgical calendar - September 1
All fixed commemorations below celebrated on September 13 by Eastern Orthodox Churches on the Old Calendar.
For August 31st, Orthodox Churches on the Old Calendar commemorate the Saints listed on August 18.Saints
- Holy 7 Virgin-martyrs, at Gaza, by the sword.
- Holy 4 Martyrs, at Perge in Pamphylia, by fire.
- Holy 366 Martyrs, at Nicomedia, by the sword.
- Martyr Phileortus, by the sword.
- Martyrs Menas, Faustus, Andrew and Heraclius.
- Saint Diadochos.
- Saint Gennadius, Patriarch of Constantinople
Pre-Schism Western saints
- Hieromartyr Cyprian, Bishop of Carthage
- Martyrs Caesidius and Companions, on the shores of Lake Fucino in Italy
- Martyrs Robustian and Mark, venerated in Milan in Italy from early times.
- Saint Paulinus, Bishop of Trier
- Saint Optatus, Bishop of Auxerre in France
- Saint Barbolenus, fourth Abbot of Bobbio Abbey in Italy
- Saint Eanswythe, Abbess of Folkestone
- Saint Aidan, Bishop of Lindisfarne, Enlightener of Northumbria
- Saints Cuthburgh and Cwenburgh, sisters, Abbesses of Wimborne
Post-Schism Orthodox saints
- Saint John Prodrom, Metropolitan of Kiev
- Saint Gennadius Scholarius, Patriarch of Constantinople
- New Hieromartyr Alexander Lyubimov, Priest, and Vladimir Dvinsky, Deacon
- New Hieromartyrs Michael Kosukhin and Myron Rzhepik, Priests
- New Hieromartyr Demetrius Smirnov
- New Martyrs of Jasenovac, Serbia
Other commemorations
- Placing of the Honourable Cincture of the Most Holy Theotokos
- Restoration of the Church of the Theotokos at the Neorion in Constantinople
- Repose of Schema-nun Gabriela of the Holy Trinity Monastery in Kiev
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