100,000 gold florins, and by 1420 the Aragonese Kingdom of Sardinia finally extended throughout the island. The subduing of Sardinia having taken a century, Corsica, which had never been wrested from the Genoese, was dropped from the formal title of the Kingdom. Through the marriage of Peter IV to Maria of Sicily (1381), the Kingdom of Sicily, as well as the duchies of Athens and Neopatria, were finally implemented more firmly into the Crown. The Greek possessions were permanently lost to Nerio I Acciaioli in 1388 and Sicily was dissociated in the hands of Martin I from 1395 to 1409, but the Kingdom of Naples was added finally in 1442 by the conquest led by Alfonso V. The King's possessions outside of the Iberian Peninsula and Balearic Islands were ruled by proxy through local elites as petty kingdoms, rather than subjected directly to a centralised government. They were more an economic part of the Crown of Aragon than a political one. The fact that the King was keen on settling new kingdoms instead of merely expanding the existing kingdoms was a part of a power struggle that pitted the interests of the king against those of the existing nobility. This process was also under way in most of the European states that successfully effected the transition to the Early Modern state. Thus, the new territories gained from the Moors—namely Valencia and Majorca—were given furs as an instrument of self-government in order to limit the power of nobility in these new acquisitions and, at the same time, increase their allegiance to the monarchy itself. The trend in the neighbouring kingdom of Castile was quite similar, both kingdoms giving impetus to the Reconquista by granting different grades of self-government either to cities or territories, instead of placing the new territories under the direct rule of nobility. Union with Castile In 1410, King Martin I died without living descendants or heirs. As a result, by the Pact of Caspe, Ferdinand of Antequera from the Castilian dynasty of Trastámara, received the Crown of Aragon as Ferdinand I of Aragon. Later, his grandson King Ferdinand II of Aragon recovered the northern Catalan counties—Roussillon and Cerdagne—which had been lost to France as well as the kingdom of Navarre, which had recently joined the Crown of Aragon but had been lost after internal dynastic disputes. In 1469, Ferdinand married Infanta Isabella of Castile, half-sister of King Henry