How did Luxembourg come under Burgundian control in 1443?

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In 1443, the duchy of Luxembourg came under the control of Philip III (the Good), the duke of Burgundy, after Elizabeth of Görlitz—the duchess of Luxembourg and niece of the Holy Roman emperor Sigismund—was forced to cede the territory to him.12

This acquisition was part of Philip’s broader policy of territorial expansion, during which he aggressively sought to conquer or absorb neighboring lands to build the Burgundian state.3