History of Bristol Welsh estate and Robert of Caen became the first Earl of Gloucester, c. 1122. He is believed to have been responsible for completing Bristol castle. In 1135 Henry I died and the Earl of Gloucester rallied to the support of his sister Matilda against Stephen of Blois who had seized the throne on Henry's death. Stephen attempted to lay siege to Robert at Bristol in 1138 but gave up the attempt as the castle appeared impregnable. When Stephen was captured in 1141 he was imprisoned in the castle, but when Robert was captured by Stephen's forces, Matilda was forced to
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,