The letter was first printed in the "Life of Christ" by Ludolph the Carthusian (Cologne, 1474),[REF] and in the "Introduction to the works of St. Anselm" (Nuremberg, 1491) [REF].
The 19th-century scholar Friedrich Münter believed he could trace the letter down to the time of Diocletian, but this is generally not accepted by present-day scholars [REF].