Hugh Bigod, John Fitzgeoffrey, Peter de Montfort, Peter de Savoy and Richard de Clare – secretly formed an alliance to expel the Lusignans from court, a move probably quietly supported by the Queen. On 30 April, Roger Bigod marched into Westminster in the middle of the King's parliament, backed by his co-conspirators, and carried out a coup d'état. Henry, fearful that he was about to be arrested and imprisoned, agreed to abandon his policy of personal rule and instead govern through a council of 24 barons and churchmen, half chosen by the King and half by the barons. His own nominees to the council drew heavily on the hated Lusignans. The pressure for reform continued to grow unabated and a fresh parliament met in June, passing a set of measures known as the Provisions of Oxford, which Henry swore to uphold. These provisions created a smaller council of 15 members, elected solely by the barons, which then had the power to appoint England's justiciar, chancellor, and treasurer, and which would be monitored through triannual parliaments. Pressure from the lesser barons and the gentry present at Oxford also helped to push through wider reform, intended to limit the abuse of power by both Henry's officials and the major barons. The elected council included representatives of the Savoyard faction but no Poitevins, and the new government immediately took steps to exile the leading Lusignans and to seize key castles across the country. The disagreements between the leading barons involved in the revolt soon became evident. Simon championed radical reforms that would place further limitations on the authority and power of the major barons as well as the Crown; others, such as Hugh Bigod, promoted only moderate change, while the conservative barons, such as Richard, expressed concerns about the existing limitations on the King's powers. Henry's son, Edward, initially opposed the revolution, but then allied himself with de Montfort, helping him to pass the radical Provisions of Westminster in 1259, which introduced further limits on the major barons and local royal officials. Crisis Over the next four years, neither Henry nor the barons were able to restore stability in England, and power swung back and forth between the different factions. One of the priorities for the new regime was to settle the long-running dispute with France and, at the end of 1259, Henry and Eleanor left for Paris to negotiate the final details