Were there castles in Viking times?
A Viking ring fortress, or Trelleborg-type fortress, is a type of circular fort of a special design, built in Scandinavia in the Viking Age. They are also known simply as trelleborgs. All trelleborgs have a strictly circular shape, with roads and gates pointing in the four cardinal directions.
What were the first castles like?
These early castles were mainly of motte and bailey type. The ‘motte’ was made up of a large mound of earth with a wooden tower on top, while the ‘bailey’ was a large ditch and bank enclosure which surrounded the motte.