Catigern (Welsh: Cadeyrn Fendigaid) is a figure of Welsh tradition, said to be a son of Vortigern, the tyrannical King of the Britons, and the brother of Vortimer. A figure of this name also appears in the Welsh genealogies, though he is given different parentage. Catigern is nearly exclusively known for a tradition in which he fell in battle with the Saxons.