BSN: John Mark

Though we today call him “John Mark,” he is never called that per se in the Bible. Rather, he is sometimes called Mark and other times called John. (Reference to both names is made in Acts 12:12, 25; 15:37.)
Luke mentions three different times that this “John” was also called “Mark” (Acts 12:12, 25; 15:37). What with John the Baptist and the apostle John, there were enough prominent men with that name in the NT to confuse even 1st-century believers.
This man worked separately with both Peter (1 Pet 5:13) and Paul (2 Tim 4:11) – though his work with Paul was interrupted for a time due to his desertion of Paul and Barnabas (Acts 13:5, 13; 15:38).
John Mark was from Jerusalem (Acts 12:12; 13:13), but left for Antioch with Barnabas and Saul (Acts 12:25).
He was the cousin of Barnabas (Col 4:10).
Church historian Eusebius (c. 260/265-339 AD), using Clement (c. 35-99 AD) and Papias (c. 60 – c.130 AD) as his sources, wrote that Mark wrote his gospel based on Peter’s teaching (Church History 2:15 and 3:39).