Martyrs Callista and her brothers, Evodius and Hermogenes, at Nicomedia

The holy martyrs renounced the idols and received the Holy Baptism, placing their faith in Jesus Christ. For this reason, they were arrested and brought before the pagan governor. Seeing their steadfastness in faith, he condemned them to death by beheading. Thus, they ended their lives as martyrs.

Although the exact date of their martyrdom remains unknown, it is believed that they lived and died during the period of the great persecutions under Diocletian (early 4th century). Their sacred relics appear to have been kept at the Monastery of Stoudios, where a liturgy in their honor was celebrated each year on September 1st.