Background
Cadwallon was born in the village of Walesey in the county of Caernarvonshire in Wales. His mother was Angharad ferch Owain, the daughter of Owain ab Edwin.
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Cadwallon ap Gruffydd
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Cadwallon"s siblings were Hywel ap Gruffydd, Rhanullt verch Gruffydd, Tudwal ap Gruffydd, Gwenllian verch Gruffydd, Elen verch Gruffydd, Merinedd verch Gruffydd, Susanna verch Gruffydd, Cadwaladr ap Gruffydd, Gwenllian II ap Rhys (born verch Gruffydd), Owain Gwynedd, Idwal ap Gruffydd, Duling ap Gruffydd, Membyr "Ddu" ap Gruffydd, Rhael verch Gruffudd, Annes verch Gruffydd, Margred ap Gruffydd, and Gwladys Rhanullt verch Gruffydd. Cadwallon was half brother of Margred verch Gruffydd. Margred verch ap Gruffydd and Gwenllian ferch Gruffydd.
The district cantref of Dyffryn Clwyd was then annexed into the kingdom of Gwynedd.
Cadwallon then is found a few years later in the valley of Dee at Mold, Flintshire, Wales. They were military leaders and directed their father"s armies which added the land regions of Meirionydd, Rhos, Rhufoniog, and Dyffryn Clwyd to the kingdom of Gwynedd.
In 1132 Cadwallon forged eastward to conquer more land for the kingdom of Gwynedd but was stopped in the area of Nanheudwy in 1133, near the town of Llangollen. An army from the kingdom of Powys then defeated and killed him.
Cadwallon"s cousin Cadwgan ap Grown ab Owain also played a part in his slaying.
Other cousins were also involved in Cadwallon"s murder. Cadwallon married Gwenllian from an unknown family line. They had a son named Cunedda ap Cadwallon ap Gruffydd ap Cynan.
Genealogy records indicate he also had another wife by the name of Alice of an unknown family line and had two sons.
He is not to be confused with the other four "Cadwallon"s (and nearly a dozen closely related named personages—homonyms, homographs and homophones) who are historically significant in Welsh history.
