The 1998 Belfast / Good Friday Agreement included the establishment of the British-Irish Council, and the 1997 advent of devolution led to the creation of the National Assembly for Wales.
Roedd Cytundeb Belfast / Gwener y Groglith 1998 yn cynnwys sefydlu’r Cyngor Prydeinig-Gwyddelig; a phan gafwyd datganoli ym 1997, fe arweiniodd hynny at greu Cynulliad Cenedlaethol Cymru.