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In page Isabella Clara Eugenia:

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It became the testing ground for the Spanish Monarchy's European plans, a boiling pot full of people of all sorts: from artists and diplomats to defectors, spies and penitent traitors, from Spanish confessors, Italian counselors, Burgundian functionaries, English musicians, German bodyguards to the Belgian Nobles. Brussels became a vital link in the chain of Habsburg Courts and the diplomatic conduits between Madrid, Vienna, Paris, London, Lisbon, Graz, Innsbruck, Prague, and The Hague could be said to run through there.[citation needed]