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In page Peace of Westphalia:

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In Münster, negotiations took place between the Holy Roman Empire and France, as well as between the Dutch Republic and Spain who on 30 January 1648 signed a peace treaty ending the Eighty Years' War[3] that was not part of the Peace of Westphalia.[4] Münster had been, since its re-Catholicism in 1535, a strictly mono-denominational community. It housed the Chapter of the Prince-Bishopric of Münster. Only Roman Catholic worship was permitted, while Calvinism and Lutheranism were prohibited.[citation needed]