Tradition identifies Mark with the author of the Gospel bearing his name. He is often identified as the young man who ran away when the Lord was arrested (Mk 14:52). His Gospel gives the teaching and memoirs of St Peter. He joined St Paul and St Barnabas on their first missionary journey and later became St Paul’s secretary in Rome. He is thought to have established the Church in Alexandria, and to have died a martyr there in 75. – CTS New Daily Roman Missal 2012, p 2651.