The American Church Dictionary and Cycopedia
Mark, Feast of Saint
Observed April 25. St. Mark is called the Evangelist because he is the writer of the Gospel which bears his name. He was the companion of St. Peter and accompanied him in his missionary travels. It is supposed that he wrote his Gospel at the dictation of St. Peter. St. Mark is said to have founded the Church in Alexandria, and one of the ancient Liturgies is called by his name. He suffered martyrdom on Easter Day, April 25th, A.D. 64, being cruelly bound with cords and dragged through the streets of the city until he was dead. It is said that his body was removed, A.D. 465, to Venice, where the famous Church of St. Mark was erected over his grave. This Festival has been observed since A.D. 750. In ecclesiastical art, St. Mark is represented with a lion at his side, with reference to the royal character of the Son of David, which is emphasized in this Gospel.
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Miller, William James. Entry for 'Mark, Feast of Saint'. The American Church Dictionary and Cyclopedia. https://www.studylight.org/dictionaries/eng/acd/m/mark-feast-of-saint.html. 1901.