William Fitz Alan, Baron Cluny & Croesowallt

Please see Darrell Wolcott: Henry, the Forgotten Son of Cadwgan ap Bleddyn; http://www.ancientwalesstudies.org/id117.html. (Steven Ferry, April 5, 2020.)

From:www.celtic-casimir.com
Sir William III FITZALAN Lord of Oswestry & Clun
Born: Before 1154, Oswestry Castle, Shropshire, England Died: 1210, Clun, Shropshire, England Events:
Alternate Birth; Abt 1163, Shropshire, England.
Marriage Information: William married Miss DE LACY, daughter of Hugh DE LACY 1st Lord of Meath and Rohese (Rose) DE MONMOUTH. (Miss DE LACY was born about 1168 in Ewyas Harold, Herefordshire, England.)

More for sources than for what's written, cpnsider those on Wikipedia: [https://en.wikipedia.org/wiki/William_Fitz_Alan,_2nd_Lord_of_Oswest...]