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William Longchamp (died 1197) was a medieval Lord Chancellor, Chief Justiciar, and Bishop of Ely in England. He first served an illegitimate son of Henry II of England, but quickly transferred to the service of Richard I, King Henry's eldest surviving son. When Richard became King of England in 1189, Longchamp paid £3,000 for the office of Chancellor, and was soon named to the bishopric of Ely and appointed legate by the pope. Longchamp governed England while Richard was on the Third Crusade, but his authority was challenged by Richard's brother, John, who eventually succeeded in driving Longchamp from power and from England. Longchamp's relations with the other leading English nobles were also strained, which contributed to the demands for his exile. When Richard was captured on his journey back to England from the crusade and held for ransom by the Holy Roman Emperor, Longchamp travelled to Germany to help negotiate Richard's release. Although Longchamp regained the office of Chancellor after Richard's return to England, he lost much of his former power. He did, however, retain Richard's trust, and was employed by the king until the bishop's death in 1197. Longchamp wrote a treatise on the law, which remained well known throughout the later Middle Ages, but he aroused much hostility among his contemporaries.