March 31 (Eastern Orthodox liturgics)
- Eastern Orthodox liturgical calendar - April 1
All fixed commemorations below are observed on April 13 by Orthodox Churches on the Old Calendar.
For March 31st, Orthodox Churches on the Old Calendar commemorate the Saints listed on March 18.Saints
- Righteous Joseph the Fair, son of Jacob, Patriarch
- Saint Acacius the Confessor, Bishop of Melitene in Pisidia
- Saint Hypatius the Wonderworker,
- Theophilos the Martyr, and those with him, in Crete.
- Martyrs Menander and Sabinus, and another 38 martyrs, in Hermopolis of Egypt, under Julian the Apostate
- Saint Apollonius of the Thebaid, ascetic
- Hieromartyrs Abdas, Bishop of Hormizd-Ardashir, and the Deacon Benjamin, of Persia
- Saint Hypatius, Abbot of Rufinus in Chalcedon
- Venerable Blaise of Amorium and Mount Athos
- Venerable Stephen the Wonderworker, ascetic.
Pre-Schism Western saints
- Saint Balbina of Rome
- Martyrs Theodulus, Anesius, Felix, Cornelia and Companions, in North Africa.
- Saint Renovatus, Abbot of Cauliana in Lusitania, then Bishop of Merida in Spain for twenty-two years
- Saint Aldo, Abbot of Hasnon Abbey in Belgium
- Saint Guy
Post-Schism Orthodox saints
- Saint Hypatius the Healer, of the Kiev Caves
- Saint Ivan I of Moscow, Prince of Moscow from 1325 and Grand Prince of Vladimir from 1328
- Saint Jonah, Metropolitan of Kiev, Moscow, and all Russia
- Saint Philaret, Abbot of Glinsk Hermitage
- Saint Innocent, Metropolitan of Moscow, Enlightener of Siberia and Alaska
- New Hieromartyr John Blyumovich, Priest
Other commemorations
- Appearance of the Iveron Icon of the Most Holy Theotokos, on Mt. Athos
- Repose of Archbishop Averky of Syracuse and Holy Trinity Monastery
- Repose of Schemanun Anastasia of Karaganda
- Repose of Archimandrite Thaddeus of Vitovnica Monastery, Serbia
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