Kontakion in the First Tone When ye received your death in the streams of the river, ye drowned the ruthless foe in the deep of your contest, O far-famed Stratonicus and Hermylus, thou men of God; wherefore, in your struggles ye were worthily guided to the water of true incorruption and glory, by Christ God, Who set your course.

Hermylos & Stratonikos the Martyrs at Belgrade

Reading from the Synaxarion:

Saints Hermylus and Stratonicus contested for piety's sake during the
reign of Licinius, in the year 314. Saint Hermylus was a deacon, and
Stratonicus was his friend. For his confession of Christ, Hermylus was
beaten so fiercely that his whole body was covered with wounds.
Stratonicus, seeing him endure this and other torments that left him half
dead, wept with grief for his friend. From this he was discovered to
be a Christian, and when he had openly professed his Faith and had
been beaten, he and Hermylus were cast into the Danube River,
receiving the crown of martyrdom.

Apolytikion in the Fourth Tone
Thy Martyrs, O Lord, in their courageous contest for Thee received as
the prize the crowns of incorruption and life from Thee, our immortal
God. For since they possessed Thy strength, they cast down the
tyrants and wholly destroyed the demons' strengthless presumption. O
Christ God, by their prayers, save our souls, since Thou art merciful.