April 12 (Eastern Orthodox liturgics)

April 11 - Eastern Orthodox liturgical calendar - April 13
All fixed commemorations below are observed on April 25 by Eastern Orthodox Churches on the Old Calendar.
For April 12th, Orthodox Churches on the Old Calendar commemorate the Saints listed on March 30.

Saints

Hieromartyr Artemon the Presbyter, of Laodicea
Martyrs Demas and Protion, and those with them, by beheading
Martyr Sabbas the Goth, at Buzău in Wallachia
Saint Isaac the Syrian, Abbot of Spoleto, Italy
Venerable monk-martyrs David, John and Menas, of Palestine, shot by archers Saint Basil the Confessor, Bishop of Parium Venerable Anthusa of Constantinople
Venerable Athanasia the Wonderworker, Abbess, of Aegina
Saint Sergius II, Ecumenical Patriarch of Constantinople

Saint Vissia, a virgin-martyr in Fermo near Ancona in Italy under Decius
Saint Victor of Braga, a catechumen martyred in Braga in Portugal under Diocletian, thus baptised in his own blood
Saint Julius I, Pope of Rome, defended St Athanasius against his Arian accusers, and also built many churches
Hieromartyr Zeno of Verona, Bishop of Verona
Saint Constantine, the first Bishop of Gap in France
Saint Wigbert
Saint Tetricus, Abbot of St Germanus in Auxerre, then Bishop of Auxerre by popular acclamation, murdered in his sleep
Saint Damian of Pavia, Bishop of Pavia in Lombardy in Italy, who vigorously opposed Monothelitism
Saint Erkemboden, a monk at Sithin in Saint-Omer in France, later Bishop of Thérouanne
Saint Alferius,, monk, founder of the Monastery of La Cava