Dodecanese Symi, Tilos, and Kastellorizo. Other islands in the chain include Alimia, Arkoi, Chalki, Farmakonisi, Gyali, Kinaros, Levitha, Marathos, Nimos, Pserimos, Saria, Strongyli, Syrna and Telendos. The name "Dodecanese" (older form ἡ Δωδεκάνησος, "hē Dōdekanēsos"; modern τα Δωδεκάνησα, "ta Dōdekanēsa"), meaning "The Twelve Islands", denotes today an island group in the southeastern Aegean Sea, comprising fifteen major islands (Agathonisi, Astypalaia, Chalki, Kalymnos, Karpathos, Kasos, Kastellorizo, Kos, Lipsi, Leros, Nisyros, Patmos, Rhodes, Symi, and Tilos) and 93 smaller islets. Since Antiquity, these islands formed part of the group known as the "Southern Sporades" (Νότιες Σποράδες). The name "Dōdekanēsos" first appears in Byzantine
Dodecanese sources in the 8th century, as a naval command under a "droungarios", encompassing the southern Aegean Sea, which eventually evolved into the Theme of Samos. However it was not applied to the current island group, but to the twelve Cyclades islands clustered around Delos. The name may indeed be of far earlier date, and modern historians suggest that a list of 12 islands given by Strabo ("Geographica" Χ.485) was the origin of the term. The term remained in use throughout the medieval period and was still used for the Cyclades in both colloquial usage and scholarly Greek-language literature until the