Helladic period
During the Helladic period, a number of major advances were developed including fortified urban settlements with monumental buildings such as corridor houses, which may prove the existence of complex societies organized by an elite or at least achieving corporate, proto-city state form. One of these settlements was Manika, located in Euboea, dated to the Early Helladic period II (2800–2200 BC). The settlement covered an area of 70-80 hectares, was inhabited by 6,000–15,000 people, and was one of the largest settlements of the Bronze Age in Greece.