The Holy Twenty-Five Martyrs who suffered by fire in Nicomedia.
The Twenty-Five Martyrs of Nicomedia were Christians who refused to sacrifice to idols during the persecutions of the early Church. Tradition relates that they were burned alive for their confession of Christ.
They are commemorated together as a company of confessors who preferred death to apostasy.
Feast day
On the New Calendar, Twenty-Five Martyrs of Nicomedia is commemorated on July 1. Churches on the Old (Julian) Calendar keep the feast on July 14 of the civil calendar.
Also commemorated on July 1

Kosmas and Damian of Rome
Martyr, Κοσμάς και Δαμιανός
Holy Unmercenary Physicians Cosmas and Damian of Rome.
Peter the Patrician of Constantinople
Venerable, Πέτρος ο Πατρίκιος
Venerable Peter the Patrician, a court official of Constantinople who became a monk.
Leon the Hermit
Venerable, Λέων ο Ερημίτης
Venerable Leon the Hermit, an ascetic who reposed in peace.
Konstantinos the Wonderworker and those with him
Saint, Κωνσταντίνος ο Θαυματουργός
Holy Martyr Konstantinos the Wonderworker of Cyprus and his companions.