e ambitions of the Kingdom of Aragon.
The Giudicato of Cagliari was allied to the Republic of Genoa. It was brought to an end in 1258 when its capital, St Igia, was stormed and destroyed by an alliance of Sardinian and Pisan forces. The territory then briefly became a colony of Pisa.
The Giudicato of Logudoro (sometimes called Torres) was also allied to the Republic of Genoa and came to an end in 1259 on the death of the judikessa (queen) Adelasia. The territory was divided up between the Doria family of Genoa and the Basserra family of Arborea, while the city of Sassari became an autonomous city-republic.
The Giudicato of Gallura ended in the year 1288, when the last giudice, Nino Visconti (a friend of Dante Alighieri), was driven out by the Pisans, who occupied the territory.
The Giudicato of Arborea had a longer life compared to the other kingdoms. It lasted some 520 years and had Oristano (Sardinian: Aristanis) as its capital. The kingdom was called Arborea after its coat of arms, which featured a green uprooted tree on a white field. The history of Arborea is entwined with the history of the Sardinian struggle for independence against Aragonese invasion.
The first king of Arborea to actively pursue the plan to unite Sardinia under the rule of Arborea was Barisone the First. He managed to be crowned King of Sardinia by the Holy Roman Empire Emperor Frederick "Barbarossa" the First in 1164. However, in order to obtain the title of King of Sardinia, Barisone the First had taken out a loan from the Republic of Genoa that he was unable to pay back. For this reason, he was imprisoned by the Republic of Genoa and was detained for 7 years. Barisone never succeeded in uniting Sardinia under his rule because of his financial problems.
In 1297, Pope Boniface VIII established on his own initiative (motu proprio) a hypothetical regnum Sardiniae et Corsicae ("Kingdom of Sardinia and Corsica") in order to settle the War of the
