During a trip to Jordan, Israel, Turkey, and Greece in the summer of 1958 "hunting for collections of manuscripts", Morton Smith also visited the Greek Orthodox monastery of Mar Saba situated between Jerusalem and the Dead Sea. He had been granted permission by the Patriarch Benedict I of Jerusalem to stay there for three weeks and study its manuscripts. It was while cataloguing documents in the tower library of Mar Saba, he later reported, that he discovered a previously unknown letter written by Clement of Alexandria in which Clement quoted two passages from a likewise previously unknown longer version of the Gospel of Mark, which Smith later named the "Secret Gospel of Mark". The text of the letter was handwritten into the endpapers of Isaac Vossius' 1646 printed edition of the works of Ignatius of Antioch. This letter is referred to by many names, including the "Mar Saba letter", the "Clement letter", the "Letter to Theodore" and "Clement's letter to Theodore".