William IV of Forcalquier

William IV, Count of Forcalquier (French: Guillaume IV d'Urgell ou Guillaume II de Forcalquier; 1130-1208) was the son of Bertrand I Count of Forcalquier and Josserande de la Flotte. William, married Adelaide de Beziers, daughter of Adelaide de Beziers and Raimond Trencavel of Beziers Viscount of Beziers, of Agde, of Albi, of Carcassonne, and of Razès.

He co-ruled the county with his brother Bertrand II, who died leaving him as sole count. He had a daughter Garsenda, who married Rainou of Sabran, Lord of Caylar and Ansouis. His daughter Garsenda predeceased him so his grand daughter of the same name inherited his county at the age of 13. He signed the Treaty of Aix with Alfonso II who was in line to become Count of Provence betrothing her to Alfonso in marriage.

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