Hieromartyr Irenaeus, Bishop of Lyons, disciple of Saint Polycarp.
Saint Irenaeus was born in Smyrna and heard Saint Polycarp in his youth. He became bishop of Lyons in Gaul, where he wrote his great work Against Heresies in defence of the apostolic faith and worked for peace between the churches.
Tradition relates that he was martyred with many of his flock in the persecution of Septimius Severus.
Feast day
On the New Calendar, Irenaeus of Lyons is commemorated on August 23. Churches on the Old (Julian) Calendar keep the feast on September 5 of the civil calendar.
Who celebrates a name day
People with these names keep their name day on this feast:
Irinaios, Irenaeus, Irineos, Ireneos
Also commemorated on August 23

Kallinikos Patriarch of Constantinople
Hierarch, Καλλίνικος Κωνσταντινουπόλεως
Saint Kallinikos, Patriarch of Constantinople and confessor.
Nicholas the Sicilian
Venerable, Νικόλαος ο Σικελιώτης
Venerable Nicholas the Sicilian, ascetic of Mount Neotakos in Euboea.
Thirty-Eight Martyrs of Thrace
Saint, Τριάκοντα Οκτώ Μάρτυρες Θράκης
Holy Thirty-Eight Martyrs who suffered in Thrace.