Dimitri/Dimitry/ Demetrios

The tradition of Demetrios probably unites that of three different persons: First, that of a martyr from Thessaloniki under Emperor Maximianus, who was an officer in the Roman army, then arrested in 303 in the persecution of Christians under Emperor Diocletian and imprisoned in the thermal baths and finally stabbed there because he had strengthened the Christians in the faith during the persecution. A second tradition is that of a deacon from Sirmium – today’s Sremska Mitrovica in Serbia, the third that of another deacon of Slavic descent in the then Roman province of Pannonia. The veneration of the deacon from Sirmium probably came to Thessaloniki after the barbarian invasions in the 5th century, at that time the area of the thermal baths in the city was fallow, so his conversion to the veneration of the saint was obvious, because in the thermal baths the church dedicated to him was built. Demetrios is one of the most venerated saints of the Eastern Church, especially in Greece and especially in Thessaloniki. According to legend, he was a brother of George.

Joachim Schäfer: Article Demetrios von Saloniki, aus dem Ökumenischen Heiligenlexikon – https://www.heiligenlexikon.de/BiographienD/Demetrios_von_Saloniki.html