The cathedral's original architect is unknown, but Pierre de Montreuil (who was involved in the building of Sainte-Chapelle) was responsible for a large part of the 13th-century work.
It is unknown who designed the Cathedral and when.
mnli hypothesis: It is unknown who designed the Cathedral and when. premise: The cathedral's original architect is unknown, but Pierre de Montreuil (who was involved in the building of Sainte-Chapelle) was responsible for a large part of the 13th-century work.