after his third marriage, he sought to reclaim his wife's lands of luxembourg, durbuy and laroche with the approval of philip of swabia. theobold therefore besieged the castle at namur, whereupon a conference was held in which philip of namur and his brother baldwin renounced the disputed territories of luxembourg, durbuy and laroche. the treaty of dinant signed 6 july 1199 at saint medard, later made it official.