Fulk FitzWarin at the time of his death in 1197. Whittington Castle lies on the English side of Offa's Dyke, which during the Norman era and before was the border between England and Wales. The site was fortified as a castle by William Peverel in 1138, in support of Empress Matilda, the daughter of King Henry I (1100–1135), in her struggle (known as The Anarchy) for the throne against King Stephen (1135–1154), grandson of William the Conqueror. In the late 1140s the lordship of Whittington, like Oswestry and Overton ceased to be part of England and became part of the Kingdom of
Henry VI the Good a pretext they used the fact that Henry III was directly responsible for the premature death of Henry V (Henry and Bolesław III's father). In the end, Władysław I the Elbow-high managed to capture almost all of Greater Poland, but his allies only took the towns of Uraz (which was given to Henry) and Wołów and Lubiąż (granted to Bolesław III). In 1314 Henry supported his brother-in-law Frederick the Fair of Austria in the battle for the throne of Germany. The war with Głogów began again in 1321. This time, however, Henry wasn't convinced as to the appropriateness of it,