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In page Peace of Westphalia:

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Peace negotiations between France and the Habsburg Emperor began in Cologne in 1636. These negotiations were initially blocked by Cardinal Richelieu of France, who insisted on the inclusion of all his allies, whether fully sovereign countries or states within the Holy Roman Empire.[1] In Hamburg, Sweden, France, and the Holy Roman Empire negotiated a preliminary peace in December 1641.[2] They declared that the preparations of Cologne and the Treaty of Hamburg were preliminaries of an overall peace agreement.[citation needed]