What is known of St Mark the evangelist?

Mark was a Jew, the son of a Mary of Jerusalem who was related to Barnabus. Mark accompanied Paul and Barnabus on the First Misssionary Journey, but returned to Jerusalem early. Paul was hesitant to have him along on the next journey. Mark was later with Paul during the latter's imprisonment in Rome. He also was in company with Peter and Timothy. Mark is most often remembered for his writing of the Gospel of Mark.