John III was buried in the Cistercian Abbey of Villers , Belgium .
In 1355 , when his two surviving sons died one right after the other , John was forced to declare his daughter Joan his heiress , which would provoke a succession crisis after his death .
John   was buried in the Cistercian Abbey of Villers , Belgium .
In 1355 , when his two surviving sons died one right after the other , John was forced to declare his daughter Joan his heiress , which would provoke a succession crisis after his death .