There are a number of reasons why people may have moved during this time. One reason is that the Dark Ages were a time of great upheaval in Greece. There were many wars and invasions, and the economy was in decline. This made it difficult for people to stay in their hometowns.
Another reason why people may have moved is that the climate of Greece was changing during the Dark Ages. The climate became drier, and this made it difficult for people to grow crops. This led many people to move to areas with a more favorable climate.
Finally, some people may have moved simply to find new opportunities. The Dark Ages were a time of great change, and this created new opportunities for people. Many people moved to cities, where they could find work in trade or manufacturing.
Whatever the reason, the Dark Ages were a time of great movement and change in Greece. The population of the country declined, and many people moved to new areas. This migration helped to shape the future of Greece, and it is still felt today.