Columbia subject headings:
Gruffydd ab Cynan, King of Gwynedd, 1055?-1137.
Wales--History--1063-1536.
Wales--Kings and rulers--Biography.
Harvard subject headings:
Gruffydd ab Cynan, King of Gwynedd, 1055?-1137.
Wales--History--1063-1284.
Wales--History--To 1063.
Wales--Kings and rulers--Biography.
Princeton subject headings:
Gruffydd ab Cynan, King of Gwynedd, 1055?-1137.
Wales--History--1063-1536.