No systematic persecution of Jews occurred in Christendom before the First Crusade.

Evidence

The Crusades present an ideal opportunity for this exploration, as not only, as far as the evidence is able to show, was there no systematic persecution of Jews within Christendom prior to the First Crusade, but the campaigns were also accompanied by violence both against Jews within Europe (for example as the First Crusade moved eastwards through German lands) and against Muslim civilians beyond Europe’s edges, in the Levant. — James Renton, Ben Gidley (eds.), Antisemitism and Islamophobia in Europe, 90

Categorization

• QUESTION: This is a strong, falsifiable claim with a specific dating — worth checking against the historiography on pre-Crusade Jewish-Christian relations (e.g., Rhineland massacres’ novelty).