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In page Marie of Savoy, Duchess of Milan:

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After the death of Filippo Maria in 1442 Marie tried to advocate for her brother Louis of Savoy to become the next duke of Milan. This was based on a proposal that Louis had made in 1434 that should either of them die without an heir then the other should inherit the others lands.[1] Louis had been married to Anne of Cyprus since 1432 but their first child was not born until (1435).[citation needed]