In 1193, Alfonso married Gersenda II of Sabran, daughter of Rainou, Count of Forcalquier of the House of Sabran and Gersend of Forcalquier, daughter of William IV of Forcalquier.[1] Garsenda was named after her mother, who was the heiress of William IV, but predeceased him. Garsenda therefore inherited Forcalquier from her grandfather. She was only thirteen years of age when, in 1193, her grandfather William IV and Alfonso II signed the Treaty of Aix whereby Garsenda would inherit William's county and would marry Alfonso, who was in line to become Count of Provence. The marriage took place at Aix-en-Provence in July 1193.