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In page Cardinal Richelieu:

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Meanwhile, Marie de Médici was exiled to Compiègne. Both Marie and the duc d'Orléans continued to conspire against Richelieu, but their schemes came to nothing. The nobility also remained powerless. The only important rising was that of Henri, duc de Montmorency in 1632; Richelieu, ruthless in suppressing opposition, ordered the duke's execution. In 1634, the cardinal had one of his outspoken critics, Urbain Grandier, burned at the stake in the Loudun affair. These and other harsh measures were orchestrated by Richelieu to intimidate his enemies. He also ensured his political security by establishing a large network of spies in France and in other European countries.[citation needed]