Roger De Montgomery, Earl of Arundel, built his castle near the River Arun at the end of the 11th Century. It features a motte (an artificial mound) which is the oldest surviving part of the castle. It has largely been handed down the generations from the female side. Apart from its unique architectural features including the wonderfully Gothic Fitzalan Chapel, are the treasures that the noble families who have owned the castle have amassed over the centuries. These include Mary, Queen of Scot's prayer book and rosary beads and a carved Rococo triptych.