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Excerpted from Les Seigneurs de Bohon by Jean LeMelletier, Coutances:
Arnaud-Bellee, 1978: In April 1173 when Prince Henry rebelled against his father, King Henry II, Richard de Lucy together with Humphrey de Bohun III invaded Scotland in an attack against King William the Lion who supported Prince Henry and the destruction of the bishop's palace at Durham. They burned Berwick and penetrated deeply into Scotland. But when they learned of the landing of Robert de Beaumont (earl of Leicester and friend of Prince Henry) in Suffolk (29 September 1173), they made a truce with William the Lion and marched against Beaumont.