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
Lakki, Leros Lakki, Leros Lakki (), population 1990, formerly Portolago (Πόρτο Λάγο), is a community on the Greek island of Leros, in the Dodecanese, at the head of Lakki Bay. The area was built up as the main base of the Italian Royal Navy in the Dodecanese starting in 1923. The town of Portolago was founded in the 1930s, under Italian rule, as a new model town, most of whose inhabitants were from the Italian military. After Leros was transferred to Greece in 1947, it was renamed Lakki. Like the rest of the Dodecanese, Leros was ruled by Italy from 1912-1943. The