William did not succeed to the margravial title, which went to his uncle Rotbold I. Around 1002, he married Gerberga, daughter of Otto-William, Count of Burgundy and Ermentrude, Countess of Mâcon and Besançon.
William did not succeed to the margravial title, which went to Rotbold. By 1013, he had married Gerberga, daughter of Otto-William, Count of Burgundy and Ermentrude, Countess of Mâcon and Besançon.