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In page John of Gaunt:

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However, John's ascendancy to political power coincided with widespread resentment of his influence. At a time when English forces encountered setbacks in the Hundred Years' War against France, with John's efforts not viewed as being as successful as his father and brother,[citation needed] and Edward III's rule was becoming unpopular owing to high taxation and his affair with his mistress Alice Perrers, political opinion closely associated the Duke of Lancaster with the failing government of the 1370s.