"Saint Demetrios of Thessaloniki (Greek: Άγιος Δημήτριος της Θεσσαλονίκης) is a Christian martyr of the early 4th century AD.
During the Middle Ages, he came to be ...
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revered as one of the most important Orthodox military saints, often paired with Saint George. His feast day is 26 October for Eastern Orthodox Christians, which falls on 8 November [NS] for those following the Old calendar. In the Roman Catholic church he is most commonly called "Demetrios of Sermium" and his memorial falls on 8 October." - (en.wikipedia.org 29.11.2019)