Eustathius, Bishop of Antioch
Saint Eustathius, the great defender of piety and illustrious opponent of Arianism, was from Side in Pamphylia. He became Bishop of Beroea (the present-day Aleppo), and in 325 was present at the First Ecumenical Council. From thence he was transferred to the throne of Antioch. But Saint Constantine the Great, led astray by the slanders directed against the Saint by the Arians, banished him to Trajanopolis in Thrace, where he reposed in 337, according to some. Others say he lived until 360.
Apolytikion in the Third Tone
O God of our Fathers, ever dealing with us according to Thy gentleness: take not Thy mercy from us, but by their entreaties guide our life in peace.
Kontakion in the Plagal of the Fourth Tone
Since thou hadst wholly purified thyself with godly deeds, thou wast a notable example of a true high priest, while excelling in divine vision and a pure life. As a pillar and foundation of the Church of Christ, thou withstoodest all temptations with great steadfastness. Hence we cry to thee: Rejoice, O Father Eustathius.