Holy Martyr Aristides the Philosopher of Athens, apologist of the faith.
St. Aristides was a philosopher of Athens in the second century who, after coming to faith in Christ, addressed a written defense of the Christians to the emperor Hadrian, and tradition relates a second to Antoninus Pius. His Apology, rediscovered in modern times, is among the earliest surviving defenses of the faith, setting Christian worship of the one Creator against the errors of the pagans and describing the pure life of the Christians.
Tradition holds that he sealed his witness with martyrdom at Athens. He is commemorated on September 13, a name day for Aristides and Aristea.
Feast day
On the New Calendar, Aristides the Philosopher is commemorated on September 13. Churches on the Old (Julian) Calendar keep the feast on September 26 of the civil calendar.
Who celebrates a name day
People with these names keep their name day on this feast:
Aristidis, Aristeidis, Aristides, Aris, Aristea
Also commemorated on September 13

Founding of the Church of the Resurrection
Saint, Εγκαίνια Ναού Αναστάσεως
Commemoration of the dedication of the Church of the Resurrection, the Holy Sepulchre, in Jerusalem.
Chronides, Leontios and Serapion
Martyr, Κρονίδης, Λεόντιος και Σεραπίων
Holy Martyrs Chronides, Leontios and Serapion of Alexandria.
Meletios Pigas of Alexandria
Hierarch, Μελέτιος Πηγάς
St. Meletios Pigas, Patriarch of Alexandria, theologian and defender of Orthodoxy.
Hierotheos the Younger of Iveron
Venerable, Ιερόθεος ο Ιβηρίτης
Venerable Hierotheos the Younger of Kalamata, monk of Iveron on Mount Athos.
Chrysostomos of Smyrna and the Hierarchs with him
Hierarch, Χρυσόστομος Σμύρνης
Hieromartyr Chrysostomos of Smyrna and the bishops martyred with him in the Asia Minor catastrophe of 1922.