Flag of Sardinia Cagliari. The late 14th century Gelre Armorial attributes the Four Moors to the Kingdom of Sardinia in the states of the Crown of Aragon. It is found in another Armorial perhaps from Lorraine area (preserved in the National Library of France) and of uncertain date but certainly in the 15th century. In 1509, another Portuguese Armorial Book (Livro do Armeiro-mor). Sardinia is represented only with the cross of St. George. The Four Moors begin to be used consistently as a symbol of the Kingdom of Sardinia during the time of the Catholic Monarchs, and especially from the time of the
Sardinia occupied the territory. The Giudicato of Arborea, having Oristano as its capital, had the longest life compared to the other kingdoms. Its later history is entwined with the attempt to unify the island into a single Sardinian state ("Republica sardisca" "Sardinian Republic" in Sardinian, "Nació sarda" or "sardesca" "Sardinian Nation" in Catalan) against their relatives and former Aragonese allies. 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 Sicilian Vespers diplomatically. This had broken out in 1282 between