The Holy 20,000 Martyrs of Nicomedia: At the beginning of the fourth century the emperor Maximian (284-305) gave orders to destroy Christian churches, to burn service books, and to deprive all Christians of rights and privileges of citizenship. At this time the bishop of the city of Nicomedia was Saint Cyril, who by his preaching and life contributed to the spread of Christianity, so that many members of the emperor’s court were also secret Christians.
On the Feast of the Nativity of Christ in the year 302, when about 20,000 Christians had assembled at the cathedral in Nicomedia, the emperor sent a herald into the church. He told the Christians that soldiers were surrounding the building, and that anyone who wished to leave had to offer sacrifice to the pagan gods. Anyone who defied the emperor would perish when the soldiers set fire to the church. All those present refused to worship the idols.
As the pagans prepared to set fire to the church, Bishop Anthimus, baptized all the catechumens and communed everyone with the Holy Mysteries. All 20,000 of those praying died in the fire. Among them were the abbess Agatha and Saint Theophila who had been saved from the den of iniquity by a miracle. Bishop Anthimus, however, managed to escape the fire.
Maximian thought that he had exterminated all the Christians of Nicomedia. He soon learned that there were many more, and that they would confess their faith and were prepared to die for Christ. The emperor wondered how to deal with them. At his command the regimental commander Zeno was arrested for openly criticizing the emperor for his impiety and cruelty. Zeno was fiercely beaten and finally beheaded.