St. Mark

The John Mark of Acts, cousin of Barnabas and companion of both Paul and Peter, remembered as the writer of the second Gospel.

Feast April 25Jerusalem and Alexandria

Canonized

Sources

Catholic Encyclopedia (Herbermann, 1907-1913), 'St. Mark' — identifies the John Mark of Acts with the Mark of the Pauline epistles and of 1 Peter, notes he was cousin to Barnabas, and that Peter calls him his son. NOTE: the encyclopedia predates the 1969 calendar reform and is NOT a source for the feast day. https://www.newadvent.org/cathen/09672c.htm
General Roman Calendar, 25 April — 'St Mark, Evangelist'. Liturgy Office, England and Wales. https://www.liturgyoffice.org.uk/Calendar/Info/General-Roman-Calendar.pdf