Manuel, Sabel, & Ishmael the Martyrs of Persia
The holy Martyrs Manuel, Sabel, and Ishmael, Persians by race and brethren according to the flesh, were sent by the Persian King as ambassadors to Julian the Apostate to negotiate a peace treaty. While with him at a place near Chalcedon, they refused to join him in offering sacrifice to his idols. Scorning the immunity universally accorded ambassadors, he had them slain in the year 362. This was a cause of the war with Persia in which Julian perished miserably the following year.
Apolytikion of Martyrs Manuel, Sabel & Ismael 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.
Kontakion of Martyrs Manuel, Sabel & Ismael in the Second Tone
Pierced through in your hearts with faith in Christ, O blessed ones, ye drank of His cup with faith, and ye hurled to the ground all the impudence of the Persians and their vaunting idolatry; and ye intercede for us all, ye equal in number to the Trinity.