Guillaume's son, Amaury began building a castle that would eventually become the eponymous Montfort-l'Amaury. The project, however, was incomplete when he died , but his son, Simon, finished it in 1067.
Guillaume's son, Amaury, began building a structure that would eventually be called Montfort-l'Amaury. Although he did not complete the project, his son, Simon, completed it in 1067.