Château-Gaillard, Les Andelys

"Richard I of England, simultaneously feudal Duke of Normandy, ordered that the castle be built in little more than 12 months, between 1197 and 1198. The goal was to protect Rouen and Richard's duchy of Normandy from the French kings, but Richard died due to an infected arrow wound on his shoulder before the fortress was complete.

The construction of Château Gaillard was taken over by his brother John. The building of the castle continued but for two alterations at John's request. One was to have an extra window built on the chapel's outer wall and the other was to have an extra toilet in the chapel." - Wikipedia