Mortefontaine is a commune in the Oise department in Northern France. The 17th-century Château de Mortefontaine was bought by Joseph B…Mortefontaine is a commune in the Oise department in Northern France. The 17th-century Château de Mortefontaine was bought by Joseph Bonaparte, elder brother of Napoléon Bonaparte, in 1798. The Convention of 1800, a friendship treaty between France and the United States, was signed in the castle. The preliminaries of the 1802 Peace of Amiens were also negotiated there.
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