 Complete the following phrase:  Hubert began to upgrade his new castles, starting with Grosmont, but was captured while fighting in France. During Huberts captivity, King John took back the Three Castles and gave them to William de Braose, a rival of Huberts. King John subsequently fell out with William and dispossessed him of his lands in 1207, but de Braoses son, also called William, took the opportunity presented by the 