After Ugolino's March 1289 death in Pisa's Tower of Muda (where he was imprisoned in the summer of 1288 for sedition and treason, his Sardinian holdings in the Cixerri reason were inherited by his son, Guelfo della Gherardesca; escaped from Pisa in 1288, he had settled in the Villa di Chiesa. Guelfo, hostile to the Pisan government, tried to seize one-sixth of the former Judicate of Cagliari (Sulcis) owned by Gherardo della Gherardesca's heirs and occupied Villamassargia's Castle of Gioiosa Guardia. Pisa's response was swift; in 1295 republican troops, supported by the forces of Marianus II of Arborea, attacked Villa di Chiesa. Guelfo was wounded near Domusnovas; after trying to escape to Sassari, he died from an infection in the hospital of Siete Fuentes. Villa di Chiesa was briefly administered by Arborea before falling under Pisan control between 1301 and 1302.