The young
From 1228 on, William was mostly in England and high in the king’s favor, and in August 1230, he accompanied the king to Brittany. William stayed in Brittany with Ranulf of Chester until February 1231, when he returned to England. In March of that year William arranged the marriage of his sister Isabel, widow of Gilbert de Clare, to Richard earl of Cornwall and brother to King Henry III. A few days after this marriage, William Marshal the younger died on April 6, 1231, at about the age of forty. There are no records of how William died, but Matthew Paris in his chronicles writes that later in King Henry III’s reign Hubert de Burgh, justiciar of England, was accused of poisoning William Marshal. There are no other sources that agree with this, and there are no other records or chronicles that give any additional information regarding William’s death. William was buried near his father in the Temple Church in London on April 15, 1231.