Adulterine castle
Adulterine castles were fortifications built in England during the 12th century without royal approval, particularly during the civil war of the Anarchy between 1139 and 1154. == Details == During the civil war of the Anarchy, fought between the factions of Stephen of England and the Empress Matilda, both sides built a number of new castles to defend their territories and act as bases for expansion, typically motte and bailey designs such as those at Winchcombe, Upper Slaughter, or Bampton by the Empress's followers.