King Harold may have lost England by backing the wrong pope

by | Aug 16, 2026 | Science

King Harold may have lost England by backing the wrong pope

A University of East Anglia historian has presented new research indicating that papal politics in Rome may have played a significant role in determining the outcome of the Norman Conquest. The research, published in a new book by Prof Tom Licence, examines previously overlooked excerpts from a lost papal letter preserved in Vatican archives to argue that King Harold’s position on religious and political matters in Rome weakened England’s standing with the papacy.

During the early 1060s, Western Christendom experienced a major schism when rival factions elected competing popes: Alexander II and Bishop Cadalus of Parma, known as Honorius II. These two leaders and their supporters engaged in a prolonged struggle for control of Rome, with Honorius receiving substantial backing from the Holy Roman Empire and support from other regions in northern Europe. Prof Licence argues that the language used by Pope Alexander II in his surviving letter reflects the political and religious rhetoric employed during this conflict, suggesting that England had aligned itself with Alexander’s rivals rather than with Alexander’s faction.

The research proposes that this shift in England’s allegiance to the papacy occurred after Harold became king in January 1066. By supporting the wrong papal faction, Harold may have inadvertently provided Pope Alexander II with political justification for backing William of Normandy’s invasion. Rather than simply opposing Harold based on allegations of oath-breaking or disputed claims to the throne, the pope may have viewed the Norman conquest as part of a broader European struggle over the future of the Church. This interpretation offers a potential explanation for why a pope would support the violent overthrow of an anointed king.

Historians have traditionally attributed papal support for the Norman invasion to Harold’s questionable claim to the English throne and accusations that he had broken an oath. Prof Licence’s analysis suggests instead that Rome had independent political motivations rooted in the schism dividing medieval Christendom. The findings are being released as the British Museum prepares to open a major exhibition featuring the Bayeux Tapestry, a prominent artifact documenting the Norman Conquest.

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