Benedetta (c. 1194 – 1232/1233) was the daughter and heiress of William I of Cagliari and Adelasia, daughter of . She succeeded her father in January or February 1214. She was consecrated in 1214 by Riccus, Archbishop of Cagliari, in the presence of the higher clergy and the grandees. She swore an oath not to diminish the territory of the giudicato, nor to alienate its castles, nor to make foreign alliances without their consent. Then, on 14 June, she married Barisone III of Arborea, son of Peter I, who was imprisoned by her father. He took the dynastic name "Torchitorio V" and they ruled their two giudicati jointly, each being cited in the acts of the other in their own giudicato. Then, Benedetta made homage to the Holy See.