Pasgen ap Cadeyrn

{{Short description|King of Powys}}

{{Use dmy dates|date=April 2022}}

Pasgen ap Cadeyrn was an ancient king of Powys and the father of Mawgan ap Pasgen, according to the Harleian genealogies.Ben Guy (2018), "The earliest Welsh genealogies: textual layering and the phenomenon of 'pedigree growth'," Early Medieval Europe 26 (4) 462–485, 473: Pascent map Cattegir, "Pasgen son of Cadeyrn". The Welsh genealogies, however, are unreliable from his father's name on. Pasgen's name also appears on the Pillar of Eliseg and as a son of Vortigern.Arthur Wade-Evans (1949–50), [https://dgnhas.org.uk/sites/default/files/transactions/3028.pdf#page=80 "Who was Ninian?"], Transactions of the Dumfriesshire and Galloway Natural History and Antiquarian Society, Ser. 3, 28: 79–91, at 86–88.Peter Bartrum (1966), Early Welsh Genealogical Tracts (University of Wales Press), 12, 46, 129. In the genealogies from Jesus College MS 20, his father is Cadell Ddyrnllug and his son's name is Manogan.Ralegh Radford, "Vortigern", Antiquity 32 (1958): 19–24, at 24. In the Harleian, he is a grandson of Cadell through Cadeyrn (Cattegirn).

One reading of the genealogies would put the beginning of his reign about two centuries before the death of Selyf ap Cynan, or about AD 417; another would put him in the period 480–510.