The administration of the Kingdom of Naples and Sicily, as well as the Duchy of Milan, was run by the Council of Italy. The island of Sardinia, which had fully come to be under Iberian sovereignty in 1409 upon the fall of the last indigenous state, was an integral part of the Council of Aragon instead and remained as such until the first years of the XVIII° century, when Sardinia was ceded to Austria and eventually handed over to the Alpine-based House of Savoy in 1720.