Orthodox Remembrance Day: January 4, April 25
Catholic Remembrance Day: April 25
Name means: dedicated to the (Roman) god of war Mars (Latin.)
Patroness: the construction worker, mason, glazier, glass painter, notary and scribe; against storms, lightning, hail, scabies, agony and unpunished or abrupt death; for good weather and good harvest
Attributes: writing with winged lion
* around 18 in Jerusalem in Israel
† 68 in Baukalis, today in Alexandria in Egypt
Mark was a Jew converted to Christianity. He was born Levite John Mark and was the son of Mary, in whose house the early Christians held their meetings (Acts 12:12). His Hellenistic ancestry betrays his name Mark and his relationship with the Cypriot Barnabas – the Letter to the Colossians refers to the two as cousins (4:10). According to the 1st letter of Peter (5:13), Peter is said to have called him son, which is supposed to indicate a personal bond between the two.
In the Old Church, the New Testament disciple Mark was of course equated with the evangelist and therefore highly revered. In later documents, Mark is also depicted as a disciple of John the Baptist or Jesus himself and his missionary activity in Antioch.
Joachim Schäfer: Article Markus, from the Ecumenical Dictionary of Saints – https://www.heiligenlexikon.de/BiographienM/Markus.htm