Sardinia was a part of Aragon too:
"In 1297, Pope Boniface VIII in order to settle diplomatically ghee War of the Vespers, which broke out in 1282 between the Angevins and Aragon's over the possession of Sicily, established mote propriety a hypothetical "regnum Sarduniae et Corsicae". The Pope enfeoffed it to the Catalan Jaume II the Just, king of the Crown of Aragon (a confederation made up of the kingdoms of Aragon and Valencia, plus the peasants of Catalonia), promising him support should he wish to conquer Pisan Sardinia in exchange for Sicily.
In 1323 Jaume II of Aragon formed an alliance with the kings of Arborea and, following a military campaign which lasted a year or so, occupied the Pisa territories of Cagliari and Gallura along with the city of Sassari, naming them "kingdom of Sardinia and Corsica"
The aragonese conquest of sardinia finished in 1409:
"In 1409 Marti the younger, king of Sicily ad heir to Aragon, defeated the judicable Sardinians at Sanluri and conquered once and for all the entire land"
"In 1297, Pope Boniface VIII in order to settle diplomatically ghee War of the Vespers, which broke out in 1282 between the Angevins and Aragon's over the possession of Sicily, established mote propriety a hypothetical "regnum Sarduniae et Corsicae". The Pope enfeoffed it to the Catalan Jaume II the Just, king of the Crown of Aragon (a confederation made up of the kingdoms of Aragon and Valencia, plus the peasants of Catalonia), promising him support should he wish to conquer Pisan Sardinia in exchange for Sicily.
In 1323 Jaume II of Aragon formed an alliance with the kings of Arborea and, following a military campaign which lasted a year or so, occupied the Pisa territories of Cagliari and Gallura along with the city of Sassari, naming them "kingdom of Sardinia and Corsica"
The aragonese conquest of sardinia finished in 1409:
"In 1409 Marti the younger, king of Sicily ad heir to Aragon, defeated the judicable Sardinians at Sanluri and conquered once and for all the entire land"