Joan Marshal
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About
Joan Marshal, FIFTH and youngest daughter of William Marshal, 1st Earl of Pembroke - the Regent of England, the greatest knight of his age - by Isabel de Clare, Strongbow's daughter. A coheir of her five brothers, every one of whom held the earldom and died without issue. She married Warin de Munchensy of Swanscombe and was mother of Joan de Munchensi, wife of William de Valence.
Research notes
✓ DOCUMENTED per COMPLETE PEERAGE 1st edn vol. VI, PEMBROKE, p.205 (entry IX) and p.204 note: 'JOAN, 5th (according to the French poem... and not, as usually supposed, the 2nd da.), who m. after 14 May 1219, Warine Monchensy... of Swayneschamp, co. Kent (d. 1255)' - her children Sir William de Monchensy (d.1289) and 'Joan m. William de Valence.' Page images supplied by Aynsley 8 Aug 2026. LOOP: wired as a fourth daughter in the EXISTING family F99540 (William Marshal I99569 x Isabel de Clare I99570), beside her sisters Isabel, Maud and Eva Marshal, all already ancestresses - so the Valence-Comyn-Talbot ladder braids into the proven Marshal/Strongbow/Aoife/Diarmait MacMurchada descent, adding a NEW ROAD to the King of Leinster. Added 8 Aug 2026.