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The Marquisate of Oristano was a marquisate of Sardinia that lasted from 1410 until 1478
It was formed after the death of Marianus V of Arborea, the second son of Eleanor of Arborea, when the giudicato of Arborea (despite the recriminations of William III of Narbonne) was subjected permanently to the Crown of Aragon to the exception of a limited area around Oristano. The new feud, together with the county of Goceano, was assigned by King Martin I of Aragon to Leonardo Cubello, who descended in direct male line from Judge Hugh II of Arborea (1321-1336).
The Marquisate was constituted by the most fertile and strategic part of the ancient giudicato: the Campidano of Cabras, Simaxis and Milis, the curatoria of Bonorzuli, the county of Goceano (with its castle) and the walled town of Oristano.
In 1478, following the defeat of Leonardo Alagon, the title of Marquis of Oristano was hired by the King of Aragon (as a ruler of Sardinia) and the city of Oristano become a royal city.
| N° | Title | Name | From | To | Spouse |
| 1 | Marquise and Count | Leonardo I Cubello-de Serra Bas | 1410 | 1427 | Quirica Deyana |
| 2 | Marquise and Count | Antonio I Cubello-de Serra Bas | 1427 | 1455 | Eleonora Folch de Cardona |
| 3 | Marquise and Count | Salvatore I Cubello-de Serra Bas | 1455 | 1470 | Caterina Centelles de Oliva |
| 4 | Marquise and Count | Leonardo II Alagon Cubello-de Serra Bas | 1470 | 1478 | Maria Linan de Morillo |
Archaeological evidence of prehistoric human settlement on the island of Sardinia is present in the form of nuraghes and other prehistoric monuments, which dot the land. The recorded history of Sardinia begins with its contacts with the various people who sought to dominate western Mediterranean trade in classical antiquity: Phoenicians, Punics and Romans. Initially under the political and economic alliance with the Phoenician cities, it was partly conquered by Carthage in the late 6th century BC and then entirely by Rome after the First Punic War. The island was included for centuries in the Roman province of Sardinia and Corsica, which would be incorporated into the diocese of Italia suburbicaria in 3rd and 7th centuries.
The Judicates, in English also referred to as Sardinian Kingdoms, Sardinian Judgedoms or Judicatures, were independent states that took power in Sardinia in the Middle Ages, between the ninth and fifteenth centuries. They were sovereign states with summa potestas, each with a ruler called judge, with the powers of a king.
Giovanni Maria Angioy was a Sardinian politician and patriot and is considered to be a national hero by Sardinian nationalists. Although best known for his political activities, Angioy was a university lecturer, a judge for the Reale Udienza, an entrepreneur and a banker.
The Judicate of Arborea or the Kingdom 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 northeast and beyond Logudoro was Gallura, with which Arborea had far less interaction. Arborea outlasted her neighbours, surviving well into the 15th century. At its greatest territorial extent it occupied the entire island except the cities of Alghero and Cagliari. The earliest known judicial seat was Tharros, though Oristano served as capital for most of its existence.
William I, royal name Salusio IV, was the judike of Cagliari, meaning "King", 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.
Marianus IV, called the Great, was the Judge (king) of Arborea, kingdom in the island of Sardinia, from 1347 to his death. He was, as his nickname indicates, the greatest sovereign of Arborea. He was a legislator and a warrior whose reign saw the commencement of massive codification of the laws of his realm and incessant warfare with the Crown of Aragon. He was also a religious man, who had connections to Catherine of Siena. He was, in short, an "wise legislator, able politician, and valiant warrior."
Hugh III was the eldest son and successor of Marianus IV of Arborea and Timbor of Rocabertí. He succeeded in 1376 as Judge of Arborea and Count of Goceano. In most ways he continued and augmented the policies of his father. He has been praised as a legislator who led a saggio e moderato governo: "wise and moderate government."
Adelasia (1207–1259), was the Judge of Logudoro from 1236 and the titular Judge of Gallura from 1238.
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.
William II was Viscount of Narbonne (1397-1424) and the nominal Judge of Arborea (1407-1420).
The Kingdom of Sardinia, also referred to as the Kingdom ofSardinia-Piedmont or Piedmont-Sardinia as a composite state during the Savoyard period, was a country in Southern Europe from the late 13th until the mid-19th century.
The Goceano is a historical and geographical region of center-north of Sardinia island, Italy. It covers a surface of 480 km2 and has a population of 13,000 inhabitants. It is located inside the Province of Sassari, the main urban centres are Bono, Italy, considered the traditional Goceano's chieftown, Anela, Benetutti, Burgos, Bultei, Nule, Esporlatu, Illorai and Bottidda.
Nostra Segnora de Mesumundu is a religious building in the territory of Siligo, Sardinia, Italy.
The Sardinians, or Sards, are a Romance language-speaking ethnic group native to Sardinia, from which the western Mediterranean island and autonomous region of Italy derives its name.
Leonardo Alagon, even Alagón or de Alagón,, was the last marquis of Oristano (1470–1478).
The Sardinian–Aragonese war was a late medieval conflict lasting from 1353 to 1420. The fight was over supremacy of the land and took place between the Judicate of Arborea -- allied with the Sardinian branch of the Doria family and Genoa -- and the Kingdom of Sardinia, the latter of which had been part of the Crown of Aragon since 1324.
The Free Municipality of Sassari or Republic of Sassari was a state in the region of Sassari in Sardinia during the 13th and 14th centuries, confederated first with the Republic of Pisa as a semi-autonomous subject and later with the Republic of Genoa as a nominally independent ally. It was the first and only independent city-state of Sardinia during the early renaissance.
Francesco Cesare Casula is a Sardinian historian from Italy.
The Kingdom of Sardinia was a feudal state in Southern Europe created in the early 14th century and a possession of the Crown of Aragon first and then of the Spanish Empire until 1708, then of the Habsburgs until 1717, and then of the Spanish Empire again until 1720.
Michele Zanche was an Italian politician, best known as a character in Dante Alighieri's Divine Comedy, where he is mentioned in Canto XXII of Inferno, in the fifth bolgia of the eighth circle, among the barrators, together with Friar Gomita, vicar of Nino Visconti judge of Gallura. He married Simona Doria, from the famous and wealthy Genoese family.