His wife is recorded in Nicholas (p.355) as Margaret of Pengwern. The name "Pengwern" must have been taken from the "capital" [family seat] of the Cornovii, for in Davis [A History of Wales pp.63-65] he discusses this term in the territory of the Cornovii. Some feel this was originally located at present Shrewsbury, but it is a Welsh name given to several sites. [See A Gazetteer of Welsh Place-Names, p.93] At any rate, Margaret seems to be from the same lineage of Tudor Trevor, who settles in the Welsh kingdom of Powys. Powys was formed from the territory of Cornovii. How about that for "internal consistency" in the old tree climbing experience.