Sources: Llantarnam Abbey; Young; Kraentzler 1408; Dictionary of National Biography. Young: Bleddyn ap Cynfyn, prince of Powys, died 1075. K: Bleddyn ap Cynvyn, Prince of Powis, "A wise and gentle ruler." ************ SOURCES: 1. _Dictionary of National Biography_. Gives many of his descendants on page 308. 2. Bartrum, Peter C. _Welsh Genealogies, AD 300-1400_. University of Wales Press, 1978; "Bleddyn ap Cynfyn 1", page 28.