After the death of the Welsh prince Llywelyn the Great in 1240 the English extended their authority into Wales as far north as the Conwy River from the result of three military campaigns to expand the royal lands of the County of Chester.
The English extended their authority into Wales as far north as the Conwy River from the result of three military campaigns. This was after the death of the Welsh prince Llywelyn the Great in 1240. This was to expand the royal lands of the County of Chester.