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While the son of a king, he did not himself seek a royal wife. In , he married Ermentrude of Roucy, whose maternal grandmother, Gerberga of Saxony, was a sister of Otto I, Holy Roman Emperor, and by this marriage alliance created a web of consanguinity between later kings of France, Germany, Burgundy and the Carolingians. Even his children's spouses, although from great families, came from widespread and scattered parts of France.