Henry's mother was unable to establish a role for herself in the regency government and she returned to France in 1217, marrying Hugh X de Lusignan, a powerful Poitevin noble. William Marshal fell ill and died in April 1219. The replacement government was formed around a grouping of three senior ministers: Pandulf Verraccio, the replacement Papal legate; Peter des Roches; and Hubert de Burgh, a former justiciar. The three were appointed by a great council of the nobility at Oxford, and their government came to depend on these councils for authority. Hubert and des Roches were political rivals, with Hubert supported by a network of English barons, and des Roches backed by nobles from the royal territories in Poitou and Touraine. Hubert moved decisively against des Roches in 1221, accusing him of treason and removing him as the King's guardian; the Bishop left England for the crusades. Pandulf was recalled by Rome the same year, leaving Hubert as the dominant force in Henry's government.