William of Capraia (died 1264) was the regent for Marianus II of Arborea from 1241 until his death, being entitled "Judge" from 1250 on.
He was the son of Ugo degli Alberti of the Counts of Capraia and Bina, the first wife of Peter I of Arborea, whom he divorced in 1191 and who subsequently remarried (1193).
When Peter II of Arborea died in 1241, William immediately assumed the regency with the alliance of the Gherardeschi, counts of Donoratico, and the Visconti. On 29 September 1250, Pope Innocent IV recognised his sovereignty in Arborea, though the Corona de Logu never did.
In 1257, William led Arborea, along with Gallura and Logudoro, the Pisan giudicati, into a war against Genoese Cagliari. After fourteen months of war, the deposed judge of Cagliari, Salusio VI, was forced to flee and his giudicato was divided up between the victors: a third to Gallura, a third to Arborea, and a third to the Gherardeschi of Pisa. Salusio's capital, Santa Igia, was destroyed. Ogliastra and Sarrabus went to John Visconti of Gallura, while the curatori of Gippi, Nuraminis, Trexenta, Marmilla inferiore, Dolia, Gerrei, and Barbagia di Seulo went to Arborea. Sulcis, Cixerri, Nora, and Decimo were granted to Gherardo and Ugolino della Gherardesca, counts of Donoratico, while Cagliari itself went to the commune of Pisa. By its expansion into the interior of the island, Arborea ensured its long-term survival in the face of external foes.
Next, William pressed his claims to Logudoro – derived from Hugh I of Arborea, who was a uterine brother of Marianus II of Logudoro – by arms. In 1259, he entered into a lifelong battle with the Doria of Genoa after the death of Adelasia, the last ruler of the native dynasty in Logudoro.
When he died in 1264, William left the regency-judgeship to his son Nicholas.
The Judicate of Arborea was one of the four independent judicates into which the island of Sardinia was divided in the Middle Ages. It occupied the central-west portion of the island, wedged between Logudoro to the north and east, Cagliari to the south and east, and the Mediterranean Sea to the west. To the north east and beyond Logudoro was located Gallura, with which Arborea had far less interaction. Arborea outlasted her neighbours, surviving well into the 15th century. The earliest known judicial seat was Tharros. The Kingdom of Arborea at the times of its maximum expansion occupied the whole island's territory, except the cities of Alghero and Cagliari.
Comita III was the giudice of Logudoro, with its capital at Torres, from 1198 until 1218. He was the youngest of four sons of Barisone II of Torres and Preziosa de Orrubu. He ruled at a time when the great families, usually foreign, were superseding the giudici in power and influence on Sardinia.
William I, regnal name Salusio IV, was the Giudice of Cagliari, or high Judge, from 1188 to his death. His descendants and those of his immediate competitors intermarried to form the backbone of the Italian Aristocracy, and ultimately their descendants in the Medici clan are precursors to, and definers of later royalty and claims thereto.
The Judicate of Cagliari was one of the four Sardinian judicates of the Middle Ages, kingdoms of Byzantine origins.
The kings or judges of Cagliari were the local rulers of the south of Sardinia during the Middle Ages. Theirs was the largest kingdom and for the eleventh through twelfth centuries contested the supremacy on the island with that of Logudoro. It was often an ally of the Republic of Pisa and an early supporter of Western monasticism.
The Judicate of Gallura was one of four Sardinian judicates in the Middle Ages. These were independent states whose rulers bore the title iudex, judge. Gallura, a name which comes from gallus, meaning rooster (cock), was subdivided into ten curatoriae governed by curatores under the judge. In the 13th century, the arms of Gallura contained a rooster.
Torchitorio V, born John and known as Chiano or Chianni, was the Giudice (Judge) of Cagliari from 1250 to his death. His reign was brief but transformative in the history of Sardinia.
Peter II was the Giudice ("Judge") of Arborea from 1221 to his death. He was also Peter IV, Viscount of Bas. He was "pious and submissive to the church" and his extensive "donations of privileges and judicial lands impoverished his state of glory."
Ubaldo II Visconti, son of Lamberto di Eldizio and Elena de Lacon, was the Judge of Gallura from 1225 to his death in 1238. He ruled every giudicato on the island of Sardinia at one point or another save Arborea.
Adelasia (1207–1259), eldest child of Marianus II of Logudoro by Agnes of Massa, daughter of William I of Cagliari, and successor of her brother, Barisone III, in 1236, was the Judge of Logudoro from 1236 and Judge of Gallura from 1238.
Benedetta was the daughter and heiress of William I of Cagliari and Adelasia, daughter of Moroello Malaspina. She succeeded her father in January or February 1214.
JohnVisconti was the Judge of Gallura from 1238 to his death. He was a member of the Visconti dynasty of Pisa.
William II Salusio V was the Judge of Cagliari from 1232 to his death. His Christian name was William, but his regnal name was Salusio, based on ancient Cagliaritan traditions which alternated their rulers between the forenames Torchitorio and Salusio. He would have been called Salusio in official documents, though he is known historically as William, after his grandfather, William I.
Marianus II was the Judge of Logudoro from 1218 until his death. He was an ally of the Republic of Genoa and enemy of Pisa.
William III, of the House of Massa, was the last Judge of Cagliari, ruling under the name Salusio VI from 1256 to his deposition in 1258. He is known also known as Guglielmo Cepolla or Cipolla.
Torchitorio III, born Peter, was the Judge of Cagliari from October 1163 to his deposition and arrest in 1188, after which he was never heard of again.
The della Gherardesca were a family of the Republic of Pisa, dating back as early as the 11th century of Longobard origin.
Marianus II was the Giudice of Arborea from 1241 to his death. With skilled military action, he came to control more than half of the island of Sardinia. By his control of the vast central plains and the rich deposits of precious metals, he increased the riches of his giudicato and staved off the general economic decline affecting the rest of Europe at the time.
Anselm of Capraia was a Pisan count. His political activity extended from the Republic of Pisa to Sardinia.
The Visconti of Pisa and Sardinia were an Italian noble dynasty of the Middle Ages. They achieved prominence first in Pisa, then in Sardinia, where they became rulers of Gallura.