The Cynfyn dynasty was a Welsh royal family that ruled parts of Wales during the 11th century. It is known for its connection to the region of Powys and played a significant role in the political landscape of medieval Wales. The dynasty is often associated with the efforts to unify various Welsh kingdoms against external threats, particularly from the Normans. One of the most notable figures of the Cynfyn dynasty was Cynfyn ap Gwerystan, who is considered a key ancestor of later Welsh rulers. The dynasty's influence waned after the rise of other powerful families, but it remains an important part of Welsh history, reflecting the complexities of tribal and royal affiliations during that era.