Investiture Controversy & Italian Wars

1076–1122 Western Europe Status: ended Casualties: Tens of thousands

The fight over who appointed bishops became the defining clash of medieval Europe. Henry IV crossed the Alps barefoot to beg pardon at Canossa (1077). Resolved at the Concordat of Worms; the precedent of papal supremacy shaped Europe for four hundred years.

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Belligerents

Papacy (Gregory VII, Urban II)
Holy Roman Empire (Henry IV)

Casualties

Tens of thousands

From World at War, an interactive atlas by Jairus Pereira. Figures are approximate, drawn from Wikipedia, UCDP, ACLED and academic sources — a design artefact, not an authoritative register. Contact.