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 Sardinia. Thus Sardinia is probably the only European country where feudalism was introduced in the transition period from the Middle Ages to the early modern period, at a time when feudalism had already been abandoned by many other European countries. In 1469, the heir to Sardinia, Ferdinand II of Aragon, married Isabel of Castile, and the "Kingdom of Sardinia" (which was separated from Corsica) was to be inherited by their Habsburg grandson, Charles I of Spain, with the state symbol of the Four Moors. The successors of Charles I of Spain, in order to defend their Mediterranean territories from raids