Historical Context
The brothers' martyrdom is placed in 312, in the final phase of the persecutions that had begun under Diocletian. The persecution had erupted at Nicomedia in February 303 with the destruction of the city's principal church, and Christians across Bithynia suffered in the years that followed until the Edict of Milan brought toleration in 313.
Anthimus of Nicomedia, by whom the brothers were baptized, served as bishop of Nicomedia in Bithynia and was himself beheaded during the same persecution. He is venerated in the Orthodox Church as a hieromartyr, commemorated on September 3. The brothers' baptism at Nicomedia and their martyrdom at nearby Nicea situate them within this broader Bithynian context of persecution.