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Saint Demetrius of Thessaloniki (Greek: Άγιος Δημήτριος της Θεσσαλονίκης) was a Christian martyr who is said to have lived in Thessaloniki in the early 4th century. During the Middle Ages, he came to be revered as one of the most important Orthodox military saints, often paired with Saint George. His memory is celebrated on 26 October.