The “Agnani Slap” was the melodramatic climax of a nasty feud between Philip IV and Boniface VIII. Its origin lay in the French king’s desire to tax the church in his realm, but its roots lay in the age-old issue of papal versus royal preeminence. Resistance to papal authority was traditionally the preserve of German kings and emperors (e.g., during the Investiture Controversy of 1075–1122 and the subsequent Guelph-Ghibelline wars, which persisted in Italy from the early twelfth century until the end of the fourteenth). But at the turn of the fourteenth century Philip IV briefly became chief
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