Person

Gruffydd ap Llywelyn

c. 1010–1063 · 11th century · Also known as Gruffudd ap Llywelyn

Gruffydd ap Llywelyn was king of Gwynedd and Powys from 1039 and, from about 1055, ruler of nearly all of Wales, the only king ever to unite it. He defeated English and Welsh rivals, raided across the border with Mercian allies and took lands east of Offa's Dyke. Harold Godwinson's campaign of 1063 broke his power, and he was killed by his own men.

Gruffydd ap Llywelyn
Image: David Powell and Humphrey Lloyd · Public domain · Wikimedia Commons

Mentioned in 2 profiles

Kingdom of PowysGovernance, DeclineKingdom of GwyneddMilitary, Decline

Mentioned in 2 state histories

Kingdom of GwentKingdom of Morgannwg

See also

Cite this entry
APA
The Epoch Institute. (2026). Gruffydd ap Llywelyn. In The Epoch Institute Encyclopedia. https://the-epoch-institute.org/encyclopedia/gruffydd-ap-llywelyn
MLA
“Gruffydd ap Llywelyn.” The Epoch Institute Encyclopedia, The Epoch Institute, 2026, https://the-epoch-institute.org/encyclopedia/gruffydd-ap-llywelyn. Accessed .
Chicago
The Epoch Institute. “Gruffydd ap Llywelyn.” The Epoch Institute Encyclopedia. 2026. https://the-epoch-institute.org/encyclopedia/gruffydd-ap-llywelyn.
Harvard
The Epoch Institute (2026) ‘Gruffydd ap Llywelyn’, The Epoch Institute Encyclopedia. Available at: https://the-epoch-institute.org/encyclopedia/gruffydd-ap-llywelyn (Accessed: ).

Last reviewed October 2026Random entry ↻