1077 CE
A defining moment in the struggle between papal and imperial authority, as the excommunicated Holy Roman Emperor Henry IV stood barefoot in the snow at Canossa to beg Pope Gregory VII for forgiveness, an event that became a lasting symbol of the power of the medieval papacy.
Religion & Power
- The Investiture Controversy between Pope Gregory VII and Holy Roman Emperor Henry IV reached a dramatic climax when Gregory excommunicated Henry in 1076, releasing his subjects from their oaths of loyalty and threatening to depose him.
- Facing a rebellion from German princes who threatened to elect a new king unless he obtained papal absolution, Henry IV crossed the Alps in winter and arrived at the castle of Canossa in northern Italy in January 1077.
- Henry reportedly stood barefoot in the snow for three days outside the castle before Pope Gregory VII agreed to lift the excommunication, though the underlying political dispute over the right to appoint bishops remained unresolved.
- The Walk to Canossa became one of the most famous episodes of the Middle Ages, symbolizing the contest between secular and spiritual authority that would continue to roil European politics for generations.
Climate & Environment
- Atmospheric carbon dioxide concentration was approximately 275 parts per million, as later confirmed by ice core analysis.
Population & Demographics
- World population is estimated to have been approximately 316 million.