Description partly based on Trautner-Kromann, 1981. For further bibliographical data and references, see Trautner-Kromann,1981, and the IMHM record., Letter to the Jews of Rome, attributed to Joḥanan ben Zakkai, with a commentary, German Hebrew cursive script, and Allony & Kupfer 1964, # 171 Trautner-Kromann, Hanne: "Et hebraisk skrift mod kristendommen fra år 53? En undersøgelse af Cod. Sim. Hebr. nr. 93". Fund & Forskning, vol. 25, 1981, pp. 7-18. "The Enigmatic Iggeret Rabbi Johanan ben Zakkai: A Polemical Letter against Christianity". Proceedings of the Eleventh World Congress of Jewish Studies. Division B, Volume 1. Jerusalem 1994, pp. 69-75.