Assertion: castle | /r/HasProperty | innovative
Facets:
Source sentences:
text: The castle was innovative, probably being the first concentric example in Europe so that the heart of the castle, the keep (or donjon, the term used at the time of construction), was thus protected by two circuits of towered walls and a perimeter ditch and barbican - a fortified wall to protect a gate - which in Dover’s case had a horizontal swing bridge that pivoted into a ditch, thus blocking the access.