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This article presents the first attempts of institutionalizing international cooperation in ancient and medieval Europe. Culture, tradition, religion and language were the most crucial factors in terms of creating the first international organizations. These factors united both the members of Greek Amphictyonic League and Symmachii as well as projects of European institutions carried out in the Middle Ages. Besides the Christian religion, empires, joining under their ruling different nations, had influence on arising of the sense of community. Organizational attempts were also taken by cities, among them the most well-known union was Hanza.

The Beginnings of Institutionalization of International Cooperation in Ancient and Medieval Europe