page_title: Judicate of Cagliari
section_title: House of Massa and Pisan domination
hierarchical_section_title: Judicate of Cagliari / House of Massa and Pisan domination
caption_attribution_description: Italiano: La chiesa (ex cattedrale) di Santa Maria di Monserrato (XIII secolo) a Tratalias, in Sardegna English: The Santa Maria di Monserrato church (former cathedral) in Tratalias, Sardinia, Italy, built in 13th century.
context_page_description: The Judicate of Cagliari was one of the four Sardinian judicates of the Middle Ages, kingdoms of Byzantine origins.
  The Judicate of Cagliari covered the entire south and central east portion of the island and was composed of thirteen subdivisions called curatoriae. To its north and west lay Arborea and north and on the east lay Gallura and Logudoro.
context_section_description: Constantine II's daughter succeeded him with her husband Peter. The Pisans tried to remove him after her death and they sent Obert, Margrave of Massa, to conquer the giudicato. The son of Obert and one of the daughter of Constantine II of Cagliari, William I became then the new judge of Cagliari.
  William spent his reign (1188 – 1214) in constant wars with Arborea, Gallura, and Logudoro. He arrested and imprisoned the judge of Arborea, Peter I and ruled Arborea in his name. He tried to conquer Gallura, but was rebuffed by Lamberto Visconti. He was on fairly good terms with the Pisans throughout his career, but on his death, he left only daughters. Benedetta, his heiress, was married to Barisone III of Arborea and thus those two giudicati were united, to be torn apart on his death (1217). Cagliari slowly declined thereafter, as various factions fought for the control of Benedetta. Pisan interference became stronger than ever. In 1256, John tried to throw off the Pisan yoke and allied with the Republic of Genoa, but was assassinated by Pisan agents. John was succeeded by his cousin William III of Cagliari; soon Pisa and the other Giudicati attacked Cagliari besieging Santa Igia. Cagliari lost the war and in 1258 the history of the giudicato came to a sudden close; his territory was partitioned in three parts that were assigned to the Della Gherardesca family, Arborea and Gallura while Pisa maintained the control over Castel di Castro.
caption: Cathedral of S. Maria of Monserrat, Tratalias
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