of Chester, was given the [[cantref]] (an administrative district) of Deffrencloyt (Dyffryn Clwyd, the Welsh for 'Vale of Clwyd'), and his family ran the area for the next 226 years. The land dispute between Reginald Grey, 3rd Baron Grey de Ruthyn, and Owain Glyndwr triggered Glyndwr's rebellion against King Henry IV,