 Both before and after the peace of 1217 he reissued Magna Carta, in which he is a signatory as one of the witnessing barons.Marshal's health finally failed him early in 1219.In March 1219 he realised that he was dying, so he summoned his eldest son, also William, and his household knights, and left the Tower of London for his estate at Caversham in Berkshire, near Reading, where he called a meeting of the barons, Henry III, the Papal legate Pandulf Verraccio, the royal justiciar (Hubert de Burgh), and Peter des Roches (Bishop of Winchester and the young King's guardian).