Three islands of the Dodecanese (Rhodes, Kos, and Kalymnos) have produced a substantial amount of published evidence which sheds light on population fluctuations and external relations during the twelfth century BC. The burial evidence from the Ialysos cemeteries indicates that the population may have increased fivefold after LH IIIB. A corresponding decrease may have occurred in southern Rhodes indicating a synoecism of the island. If this is so, the reasons may be related to the increasing prosperity of the main town, Ialysos. This is a period of regional diversity. Distinctive island pottery styles developed under marked Minoan influence. However, mainland influence was stronger, broader, and more constant. None of these islands appears to have contributed to the development of IIIC styles elsewhere nor actively participated in maritime trade. Rhodes and Kos acquired objects from the east Mediterranean and Europe. At this time, there is evidence for a revival of sea travel within and beyond the Aegean. Rhodes, in particular, benefited from this but may primarily have been a passive recipient. The resulting prosperity could have been one factor which drew people to the area of Ialysos in a process of synoecism.