Guelphs and Ghibellines
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The Guelphs and Ghibellines were factions supporting, respectively, the Papacy and the Holy Roman Empire in central and northern Italy during the 12th and 13th centuries. The struggle for power between the Papacy and the Holy Roman Empire had arisen with the Investiture Conflict of the 11th century.
The Guelphic tradition accuses Pietro della Vigna, as well as the emperor and the court, of heresy. It was even stated, probably without any foundation, that they were the authors of the famous work, De tribus impostoribus, wherein Moses, Christ and Mahomet are blasphemed.
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