Castles are where Kings, Queens. Lord’s or Nobles lived. In addtion to being a residence for the ruler of the area they were also fortified to defend against invaders. Castles were built mostly in the 9th and 10th century or Middle Ages. They come various shapes, sizes and features such as a protective wall surrounding the castle or windows that were built for arrow slits. An arrow slits was so an archer could fire his weapon at an invader and still be protected by the thick wall of the castle from return fire.