Dodecanese of the major islands under Italian rule back to twelve. Thus, when the Greek press began agitating for the cession of the islands to Greece in 1913, the term used was still the "Dodecanese". The Italian occupation authorities helped to establish the term when they named the islands under their control "Rhodes and the Dodecanese" ("Rodi e Dodecaneso"), adding Leipsoi to the list of the major islands to make up for considering Rhodes separately. By 1920, the name had become firmly established for the entire island group, a fact acknowledged by the Italian government when it appointed the islands' first
Kasos island formally joined the Kingdom of Greece on 7 March 1948 together with the other Dodecanese islands. Kasos Kasos (; , ), also Casos, is a Greek island municipality in the Dodecanese. It is the southernmost island in the Aegean Sea, and is part of the Karpathos regional unit. , its population was 1084. The island is known in Italian as "Caso". Kasos lies southwest of Karpathos, between this island and Crete. Adjacent to the island is the Strait of Kasos, through which some of the Modified Atlantic Water enters the Sea of Crete. Its shape is elliptic and resembles