Election to the Episcopate
The account of Alexander's selection turns on the discernment of St. Gregory the Wonderworker, Bishop of Neocaesarea, who had been invited to preside over the choice of a new bishop for Comana after the previous bishop's death. When the candidates put forward were judged by nobility, learning, or wealth, Gregory objected that a bishop should have not only external merits but, first of all, a pure heart and a holy life.
When someone mockingly proposed Alexander the charcoal-burner, Gregory took the suggestion seriously. Summoning Alexander, he questioned him before the assembly about the Holy Scriptures; Alexander answered as a knowledgeable and wise pastor, and those present elected him their bishop. The tradition holds that Gregory recognized in the humble laborer a man of great capabilities and genuine sanctity.
Martyrdom
Alexander administered the see of Comana with wisdom before suffering martyrdom in a Roman persecution. He confessed Christ and refused to offer worship to idols; after enduring torture, he was burned to death, surrendering his soul to God.
The sources most commonly assign his martyrdom to the persecution under the emperor Decius (c. 250-251), consistent with his placement in the 3rd century. One retelling instead names the persecution under Diocletian, but the Decian dating is the tradition followed here and accords with the saint's pre-Nicene era.
Sources and Historical Record
The principal source for Alexander's life is a discourse pronounced by St. Gregory of Nyssa on the life of St. Gregory Thaumaturgus, in which the election of Alexander is described in passing. Beyond this incidental notice, little biographical detail survives, and his name is absent from the ancient Greek and Roman calendars.