Npnf-201 iii.vii.xvi Pg 5
John Mark, son of Mary (Acts xii. 12), a sister of Barnabas (Col. iv. 10), was a companion of Paul and Barnabas in their missionary journeys, and afterward a companion of Barnabas alone (Acts xv. 39), and still later was with Paul again in Rome (Col. iv. 10 and Philemon 24), and with Peter when he wrote his first epistle (1 Pet. v. 13