Commemorated on October 26th
Saint Demetrios suffered in Thessalonica during the reign of Galerius Maximian (c. 306). He belonged to one of the most distinguished families of the province of Macedonia and was widely admired not only because of his noble ancestry and grace of bearing, but also for virtue, wisdom and goodness of heart surpassing that of his elders.
The military expertise of Saint Demetrios led Galerius, as Caesar of the Eastern Empire, to appoint him commander of the Roman forces in Thessaly and Proconsul for Hellas. But for all this, Demetrios remained ever aware of the underlying realities of life. Since faith in Christ had touched his heart, all the glory of this world meant nothing to him, and there was nothing he preferred to teaching and preaching the word of God.
Despite the persecution directed against Christians by the Emperor, Saint Demetrios brought a large number of pagans to the faith. His words convinced them because they saw in the righteousness, peace and brotherly love that marked his life an illustration of the truth of which he spoke.
The feast and commemoration of Saint Demetrios is celebrated with the Divine Liturgy of Saint John Chrysostom which is conducted on the morning of the feast and preceded by a Matins (Orthros) service. A Great Vespers is conducted on the evening before the day of the Feast.
To Read More about St. Demetrios, the Greek Orthodox Archdiocese of America website.