William des Roches

William des Roches (or Guillaume des Roches) (1165–1222), seneschal of Anjou, was a knight in the service of the Angevin kings of England, and King Philip II of France after 1202. Guillaume was born somewhere in Anjou, most likely at Longué-Jumelles.

William des Roches early in his life had been a mesnie knight of King Henry II of England. During the rebellion of 1189, Richard of Poitou (later Richard I of England) and King Philip II of France attacked the ageing king of England in the city of his birth, Le Mans. Guillaume had participated in the defense of Le Mans in the company of such knights as William Marshal and Gerard Talbot and was with King Henry when he was forced to flee the city. According to "The History of William the Marshal", des Roches rode in the vanguard of the retreating royal force. He wheeled around with William Marshal and engaged Count Richard's vanguard where he successfully charged and knocked Philip de Colombiers off of his horse.

After the death of King Henry, Guillaume enrolled in the royal mesnie of Richard, now King of England, Duke of Normandy and Aquitaine and Count of Anjou. William was a trusted confidant of King Richard, and during the Third Crusade he was involved in the conquest of Sicily, the Siege of Acre, the Battle of Arsuf, and the Battle of Jaffa. In 1192, he was sent with Pierre de Preaux and Gerard de Fournival as part of a deputation to obtain safe conducts for the crusading host to enter Jerusalem and its environs. William remained a steadfast adherent to Richard in his wars with King Philip of France from 1194–1199 and it may have been at this time that he was arranged to be married to Marguerite, the daughter and heiress of Robert de Sablé.

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