Dodecanese relative quiet and prosperity. In 408 BC, the three cities of Rhodes had united to form one state, which built a new capital on the northern end of the island, also named "Rhodes"; this united Rhodes was to dominate the region for the coming millennia. Other islands in the Dodecanese also developed into significant economic and cultural centers; most notably, Kos served as the site of the school of medicine founded by Hippocrates. However, the Peloponnesian War had so weakened the entire Greek civilization's military strength that it lay open to invasion. In 357 BC, the islands were conquered by
Dodecanese campaign Dodecanese campaign The Dodecanese campaign of World War II was an attempt by Allied forces to capture the Italian-held Dodecanese islands in the Aegean Sea following the surrender of Italy in September 1943, and use them as bases against the German-controlled Balkans. Operating without air cover, the Allied effort failed, with the whole of the Dodecanese falling to the Germans within two months, and the Allies suffering heavy losses in men and ships. The Dodecanese campaign, lasting from 8 September to 22 November 1943, resulted in one of the last big German victories in the war. The Dodecanese island group