 Bohun 's spent most of his early career reconquering Marcher lands captured by Llywelyn ap Gruffudd during the Welsh war in England . This was finally accomplished through Edward I 's war in Wales in 1277 . Hereford also fought in Wales in 1282 – 83 and 1294 – 95 . At the same time he also had private feuds with other Marcher lords , and his conflict with Gilbert de Clare , Earl of Gloucester , eventually ended with the personal intervention of King Edward himself . Hereford 's final years were marked by the opposition he and Roger Bigod , Earl of Norfolk , mounted against the military and fiscal policy of Edward I. The conflict escalated to a point where civil war threatened , but was resolved when the war effort turned towards Scotland . The king signed the Confirmatio Cartarum – a confirmation of Magna Carta – and Bohun and Bigod agreed to serve on the Falkirk Campaign . Bohun died in 1298 , and was succeeded by his son , Humphrey de Bohun , 4th Earl of Hereford . 
