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Why was Robert of Naples an opponent of Louis IV in Italy?

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Robert of Naples was a staunch leader of the Guelf party, which supported the papacy in its political and military conflicts against the Ghibelline faction in Italy.1

His opposition to Louis IV was rooted in this deep-seated alliance with the papacy, particularly under Pope John XXII. The Pope viewed Louis IV’s imperial ambitions as a direct threat to papal authority and the stability of the church, especially after Louis supported the Ghibellines in Milan and Verona and challenged the necessity of papal confirmation for his imperial title.12

Because Robert served as the papal-appointed imperial vicar in Italy and was committed to defending Guelf interests, he stood in direct opposition to Louis IV’s Italian expedition (1327–1330). Louis’s actions—including his coronation in Rome and the installation of an antipope, Nicholas V—further solidified the divide between the imperial camp and the pro-papal forces led by Robert.12