Ancient Sikyon, in the northeastern Peloponnese, was a major player on the Mediterranean stage, especially in the Archaic and Hellenistic periods. This comprehensive study combines a discussion of the geological and historical background with the results of original research based on many years of archaeological fieldwork. Author Yannis Lolos, drawing upon the limited excavations in Sikyonia, literary sources, and mostly his own extensive survey data, traces the history of the human presence in the territory of Sikyon from prehistory to the early modern period. A series of detailed maps plots the position of many previously unknown roads, fortifications, and settlement sites.