Writ of Holy Roman Emperor Louis IV [Present-day Germany]: “Louis, the Bavarian (‘Ludwig der Baier’) orders his chamber-servants, the Jews of Speyer to pay/submit their tithe (‘Zehnten’)* to the Archbishop Peter of Mainz.” [Researcher’s note: The above is a translation of a German summary of the original Latin text which can be found in Guden’s Codex Diplomaticus (Volume III). *Zehnt was approximately a 10% mandatory tax due to the church, or a king, or local ruler.]
Regesten zur Geschichte der Juden in Deutschland während des Mittelalters. Bearbeitet von Dr. M. Wiener. Erster Teil. (Regesta regarding the history of Jews in Germany during the Middle Ages. Edited by M[eir] Wiener, PhD. First Part.); (Hannover; 1862); Researched and Translated by Ziba Shadjaani 7/10/2020