The Gospel of Mark was Mark of Jerusalem's account of the life of Jesus Christ. It was written in Ephesus while Mark was there with Paul of Tarsus and Barnabas, building up the newly-founded Christian church. Written in Hebrew and Aramaic, the gospel was eventually sent back to Byzantium for translation into Greek by the scribes, Amos, Rayhab and Reuben.
It was while visiting these scribes that the First Doctor examined Mark's hand-written originals. He thought the experience incomparably superior to his adventures with the Aztecs, the French Revolutionaries, or Marco Polo; better than his witnessing of the assassination of President McKinley or the events of the Passchendaele, Dunkirk — better even than the time when he had sailed around the Caribbean Sea on a pirate ship. The experience reminded him of the time he had helped William Shakespeare on the early drafts of Hamlet. (PROSE: Byzantium!)