_Elidir ___________ _Gwriad K of Man___|___________________ _Merfyn Frych K of Gwynedd_| | | _Cynan Dindaethwy _ | |_Esyllt of Gwynedd_|_Mahallt of Flint__ _Rhodri Mawr K of Wales_| | | ___________________ | | ___________________|___________________ | |_UNKNOWN __________________| | | ___________________ | |___________________|___________________ _Cadell K of Deheubarth_| | | ___________________ | | ___________________|___________________ | | ___________________________| | | | | ___________________ | | | |___________________|___________________ | |_UNKNOWN _______________| | | ___________________ | | ___________________|___________________ | |___________________________| | | ___________________ | |___________________|___________________ | |--Hywel Dda K of Wales | | ___________________ | ___________________|___________________ | ___________________________| | | | ___________________ | | |___________________|___________________ | ________________________| | | | ___________________ | | | ___________________|___________________ | | |___________________________| | | | ___________________ | | |___________________|___________________ |_UNKNOWN _______________| | ___________________ | ___________________|___________________ | ___________________________| | | | ___________________ | | |___________________|___________________ |________________________| | ___________________ | ___________________|___________________ |___________________________| | ___________________ |___________________|___________________
Bartrum's "Welsh Genealogies".
Hywel inherited Seisyllwg from his father, CADELL and became ruler
of Dyfed when Llywarch ap Hyfaidd, his wife's brother died in 904. It is
possible that Hywel had Llywarch killed. To these lands, apparently
sometime around 930, he added Brycheiniog. This enlarged kingdom
became known as Dehubarth. In 942 Hywel gained control of Gwynedd
and Powys when his cousin IDWAL ab ANARAWD ap RHODRI (RIN 2582)
was killed in a revolt against Wessex. This made him ruler of all Wales
with the exception of Glamorgan in the souteast corner. Hywel, although
sovereign, was in some way subject to the overlordship of the Kingdom
of Wessex.
Hywel's crowning achievement was his codification of the laws of
Wales. It is for this that he probably was given the description "the
Good" by his descendants.
When Hywel died in 950, He passed the newly created kingdom of
Dehubarth on to his son, OWAIN. Gwynedd and Powys were returned to
the descendants of his cousin, IDWAL (see above).