WI
William IV Count of Forcalquier
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William IV (d.1209), Count of Forcalquier, last of his line, left his Alpine county to his granddaughter Garsenda, whose marriage carried it to Provence.
Research notes
✓ ES: WILLIAM IV (d.1209); father of Garsenda the heiress (our line). Added 14 Sep 2026. UPDATE 25 Oct 2026: he is Medieval Lands' Guillaume [II] de Forcalquier (ES numbers him IV); wife Adelaide de Beziers and parents Bertrand I x Josserande wired ✓; the line above through Guilhem de Urgell and Adelaide of Forcalquier to the counts of Provence is wired at ~ (two unproven rungs), RINGING into Guillaume II of Provence.