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In page Rouen:

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On 24 June 1204, King Philip II Augustus of France entered Rouen and definitively annexed Normandy to the French Kingdom. He demolished the Norman castle and replaced it with his own, the château Bouvreuil, built on the site of the Gallo-Roman amphitheatre.[citation needed] A textile industry developed based on wool imported from England, for which the cities of Flanders and Brabant were constantly competitors, and finding its market in the Champagne fairs. Rouen also depended for its prosperity on the river traffic of the Seine, on which it enjoyed a monopoly that reached as far upstream as Paris.[citation needed]