In 1066 the Normans took over the Viking battle then they marched to England and built over 500 castles in one year. They built castles to protect themselves from William and his army they dug ditches and made a Motte and they started to build with wood But eventually tirnt it into stone.
Normans built castles to protect and defend. The design helped as it was strong and hard to break down once they were turned to stone. The last MoTTe and Bailey castles was built in 1200.
TheNorman's used lots of defence systems to protect themselves.