Cadwallon ap Cadfan (Welsh: Cadwallon ap Cadfan; died 634) was a 7th‑century king of the Welsh kingdom of Gwynedd. He is most noted for his military alliance with the Mercian king Penda against the Northumbrian kingdom, and for his role in the events surrounding the death of King Edwin of Northumbria and the subsequent Battle of Heavenfield, where he was killed.
Biography
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Parentage and Succession: Cadwallon was the son of Cadfan ap Iago, a previous king of Gwynedd. Contemporary Welsh genealogies list him as the father of Cadwaladr, who later became king of Gwynedd. Exact dates of his birth are not recorded.
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Reign: Cadwallon’s reign is usually placed between c. 625 and his death in 634. During this period, Gwynedd was one of several Brythonic kingdoms attempting to resist the expansion of the Anglo‑Saxon realm of Northumbria.
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Alliance with Mercia: In 632, Cadwallon allied with Penda of Mercia, a powerful pagan king of the Anglo‑Saxon kingdom of Mercia. Together they defeated the Northumbrian king Edwin at the Battle of Hatfield (also known as the Battle of Hatfield Chase). This victory temporarily halted Northumbrian dominance in the north.
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Campaigns in Northumbria: Following Edwin’s death, Cadwallon launched a series of raids into Northumbrian territory, targeting the sub‑kingdoms of Bernicia and Deira. Contemporary sources describe his actions as a mix of punitive raids and attempts to re‑establish Brythonic control in the region.
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Battle of Heavenfield: In 634, Cadwallon faced the Northumbrian king Oswald, who had succeeded Edwin. The two forces met at Heavenfield near present‑day Hexham in Northumberland. Oswald’s army defeated Cadwallon’s forces; Cadwallon was slain in the battle, marking the end of his attempts to check Northumbrian expansion.
Historical significance
Cadwallon’s alliance with Mercia and his subsequent campaigns represent a brief but notable period of Brythonic resistance to early Anglo‑Saxon hegemony in northern Britain. His death at Heavenfield paved the way for the consolidation of Northumbria under Oswald, who would become a celebrated saint and ruler.
Sources and historiography
The primary references to Cadwallon ap Cadfan come from early medieval Welsh annals (such as the Annales Cambriae), the Anglo‑Saxon Chronicle, and later hagiographies of Saint Oswald. Modern scholarship generally treats these sources as the basis for reconstructing Cadwallon’s life, while acknowledging the limited and sometimes contradictory nature of the contemporary records.
Legacy
Cadwallon appears in later Welsh tradition and poetry as a symbol of resistance against foreign domination. His grandson, Cadwaladr, is remembered in both Welsh and English legendary material, and Cadwallon’s name persists in various place‑names and literary works referencing early medieval Britain.