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In page Élisabeth of France:

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Her body was buried in a common grave at the Errancis Cemetery in Paris.[4] At the time of the Restoration, her brother Louis XVIII searched for her remains, only to discover that the bodies interred there had decomposed to a state where they could no longer be identified. Élisabeth's remains, with that of other victims of the guillotine (including Robespierre, also buried at the Errancis Cemetery) were later placed in the Catacombs of Paris. A medallion represents her at the Basilica of Saint Denis.