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William de Valence 1st Earl of Pembroke
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William de Valence, 1st Earl of Pembroke (c.1226-1296), half-brother of King Henry III; came to England 1247 with his Lusignan brothers, fought through the Barons' Wars and died the last of the king's Poitevin kin. Father of Joan de Valence.
Research notes
✓ DOCUMENTED (Wikipedia/DNB; web-confirmed 8 Aug 2026): 4th son of Hugh X de Lusignan, Count of La Marche, by ISABELLA OF ANGOULEME, widow of King John - LOOP: his mother is I99791, already in the tree as King John's queen, so this line braids back to the Angouleme/Lusignan bed. m. Joan de Munchensi. Added 8 Aug 2026.