Taught me two things so far: Sometimes there is no time to fear or doubt in yourself. There is always a reason for what mage is doing, even if it looks stupid from the side. Especially if the mage is a jester.
First built in the castle became a royal palace for Edward I and Eleanor of Castile in who added the successive gatehouse defences of the barbican. It was later transformed by Henry VIII for Catherine of Aragon.