Knights' interest in shipping and commerce, launched what was to be a period of several centuries of prosperity for Symi, as its location amidst the Dodecanese made it an important waypoint for trade until the advent of steam-powered shipping in the 19th century. The island was conquered from the Knights by the Ottoman Empire in 1522 (along with nearby Rhodes) but it was allowed to retain many of its privileges, so its prosperity continued virtually uninterrupted. Under the Ottomans the island was called Sömbeki. Symi was noted for its sponges which provided much of its wealth. It attained the height of its prosperity in the mid 19th century, and many of the peculiarly colorful neoclassical mansions covering the slopes near the main city date from that period. Although Symiots took part in the Greek War of Independence of 1821–1829, it was left out of the new Greek state when its borders were drawn up and so remained under Ottoman rule.
Modern era
The island, along with the rest of the Dodecanese, changed hands several times in the 20th century: in 1912 the Dodecanese declared independence from the Ottomans as the Federation of the Dodecanese Islands, though they were almost immediately occupied by Italy. The island was formally ceded to Italy in 1923, and on 12 October 1943 it was occupied by the Nazis. At the end of World War II, the surrender of German forces in the region took place on Symi and the island was subject to several years of occupation by the British. Symi was finally rejoined with Greece in 1948.
The island has become a haven for tourists from abroad, especially British and Italians, and is now the permanent home of about 120 non-Greek residents, some 50 of whom are British. The influx of tourists has led to the restoration of a great number of homes (many of which were destroyed during World War II); these restorations, by law, have to conform to "guidelines laid down by the Greek culture ministry's Archaeological
