Cadwallon is a historical figure known as a king of Gwynedd, a region in north Wales during the early 7th century. He is often recognized for his role in the power struggles among the Welsh kingdoms and his conflicts with the Anglo-Saxon kingdoms, particularly Northumbria. Cadwallon is notable for his military campaigns, which aimed to unify the Welsh against external threats. His reign is marked by significant battles, including the famous victory at Heavenfield in 634 AD, where he defeated the Northumbrian king Oswald. Cadwallon's legacy is remembered in Welsh history as a symbol of resistance.