“Assisiae regum regni Siciliae VI” issued by King Fredrick II of Sicily [Kingdom of Sicily; Present-day Italy] [Provisional]: “Jews […] are not allowed to purchase and keep Christian slaves under any circumstance or (different) titles.”
Vering, Friedrich H: Archiv für katholisches Kirchenrecht mit besondere Rücksicht auf Deutschland, Oesterreich und die Schweiz. Volume 48; (Mainz; 1882), p. 20. Researched and Translated by Ziba Shadjaani 3/9/2016