+1076 marked a pivotal year in the [Investiture Controversy](/wiki/Investiture_Controversy). [Pope Gregory VII](/wiki/Pope_Gregory_VII) excommunicated [Henry IV](/wiki/Henry_IV), Holy Roman Emperor, shaking the foundations of medieval imperial power. This act intensified the struggle between secular and ecclesiastical authority.
+## See also
+- [Medieval Europe](/wiki/Medieval_Europe)
+- [Holy Roman Empire](/wiki/Holy_Roman_Empire)
+- [Papacy](/wiki/Papacy)
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