Holy Three Hundred and Sixty-Six Martyrs who suffered at Nicomedia.
The synaxaria record that three hundred and sixty-six Christians of Nicomedia confessed Christ and were put to death together.
They are honoured as a company on this day.
Feast day
On the New Calendar, 366 Martyrs of Nicomedia is commemorated on August 31. Churches on the Old (Julian) Calendar keep the feast on September 13 of the civil calendar.
Also commemorated on August 31
Deposition of the Belt of the Theotokos
Saint, Κατάθεση Τιμίας Ζώνης
Placing of the Honourable Belt of the Most Holy Theotokos in the Church of Chalkoprateia.