The Monk Martyr Euthymius, Igumen of the Vatopedi Monastery on Mount Athos, and twelve other monks suffered martyrdom for denouncing the Latinizing Patriarchs Michael Paleologos (1261-1281) and John Bekkos (1275-1282) as heretics. Saint Euthymius was drowned in the sea, and the monks were hanged.
Troparion — Tone 4
Your holy martyr Euthymius, O Lord, / Through his sufferings has received an incorruptible crown from You, our God. / For having Your strength, he laid low his adversaries, / And shattered the powerless boldness of demons. / Through his intercessions, save our souls!