 Otto had married Margaret, daughter of Theobald V, Count of Blois, in 1192.After her husband's death her brother-in-law King Philip enfeoffed her with the Burgundian county, as regent for her minor daughter Joanna I.Upon Joanna's death in 1205, Otto's second daughter, Beatrice II, became countess and Philip had her marry Otto I, Duke of Merania.