File:Henry IV surrendered to Pope Gregory VII.jpg - Wikimedia Commons
Pope Gregory IV - Wikipedia
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Pope Gregory IV, was Pope from October 827 to his death in 844 Stock Photo - Alamy
Why did Henry IV stand barefoot in the snow for three days begging forgiveness of Pope Gregory VII? - Quora
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Holy Roman Emperor Henry IV doing penance to reverse his excommunication by Pope Gregory VII - Catholicireland.netCatholicireland.net
Pope Gregory VII Biography - Facts, Childhood, Family Life & Achievements
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Pope Gregory VII (Hildebrand), 1020-1085 • History of the Germans Podcast
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Saint Gregory the Great | Biography, Papacy, Feast Day, Legacy, & Facts | Britannica
Pope Saint Gregory the Great - Saints & Angels - Catholic Online
Emperor Henry IV Waiting Three Days Upon Pope Gregory VII"
File:101-Gregory IV.jpg - Wikimedia Commons
