the settlement in Malta of noble families from Sicily and Aragon between 1372 and 1450, the arrival of several thousand Greek and Rhodian sailors, soldiers and slaves with the Knights of St. John, the introduction of several thousand Sicilian labourers in 1551 and again in 1566, the emigration to Malta of some 891 Italian exiles during the Risorgimento in 1849, and the posting of some 22,000 British servicemen in Malta from 1807 to 1979.