With both Stephen and Robert held prisoner, negotiations were held to try to come to agreement on a long-term peace settlement, but Queen Matilda was unwilling to offer any compromise to the Empress, and Robert refused to accept any offer to encourage him to change sides to Stephen. Instead, in November the two sides simply exchanged the two leaders, Stephen returning to his queen, and Robert to the Empress in Oxford. Henry held another church council, which reversed its previous decision and reaffirmed Stephen's legitimacy to rule, and a fresh coronation of Stephen and Matilda occurred at Christmas 1141. Stephen travelled north to raise new forces and to successfully persuade Ranulf of Chester to change sides once again. Stephen then spent the summer attacking some of the new Angevin castles built the previous year, including Cirencester, Bampton and Wareham.