Demetrius of Thessaloniki

Saint Demetrius (or Demetrios) of Thessalonica (Greek: Ἅγιος Δημήτριος τῆς Θεσσαλονίκης, Hágios Dēmḗtrios tēs Thessaloníkēs), also known as the Holy Great-Martyr Demetrius the Myroblyte (meaning 'the Myrrh-Gusher' or 'Myrrh-Streamer'; 3rd century – 306), was a Greek Christian martyr of the early 4th century AD.

During the Middle Ages, he came to be revered as one of the most important Orthodox military saints, often paired with Saint George of Lydda.

In the Roman Catholic Church he is most commonly called Demetrius of Sirmium and his memorial is 9 April in the 2004 Roman Martyrology and 8 October in the martyrology of the Extraordinary Form. It is debated whether Demetrius of Thessalonica and Demetrius of Sirmium are the same person.

Source: Wikipedia — https://en.wikipedia.org/wiki/Demetrius_of_Thessaloniki