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Engraved portrait of Pierre I, Duke of Brittany, in chainmail armor, hands clasped in prayer. Printed text at the bottom details his life: destined for the church, married to Alix of Brittany, supporter of Philippe-Auguste, prisoner in Mansourah in 1248, died at sea in 1250. Reverse: postcard by F. Chapeau, publisher Rennes, with space for address and postmark.