 Moses is first mentioned in 1549 as an envoy of the Jacobite Patriarch of Antioch, Ignatius Abdullah I Stephan, to Rome to seek the means to print Syriac copies of the New Testament.His mission also included negotiations of unity with the Catholic Church in anticipation of the Patriarch's arrival.Whilst in Rome, Moses stayed in the monastery of St Stephen of the Abyssinians where Johannes Potken had printed the first Ge'ez book, "Psalterium David et Cantica aliqu".