St. Euthymius the New of Thessalonica
We commemorated him today - I couldn't find much about him on line and Fr. Michael told us about the Martyr Lucian, Presbyter of Antioch (who we also commemorated) instead.
But he had a good line in one of the chants:
"Your radiant light astonished the Angels
And openly alarmed the savage demons"
So, whatever else he did, I like him for openly alarming savage demons!