Diplomacy remained, for the most part, rudimentary in ancient Greece, but there is no doubt that a pattern had emerged. The structure of the inter-state system caused another diplomatic formation as a means of foreign policy, forming alliances. In this line, considerable attention was given to the winning of allies and making of treaties during the 5th and especially 4th centuries. The duration of the alliances were mainly specified, particularly in the 5th century since alliances were founded on the basis of allying for war. In other words, city-states, aware of their weaknesses in face of each other, formed alliances in case of a threat of war. In the 4th century, alliance treaties began to be specified in duration as for ever, and the reason for this may be the new understanding of inter-state relations that alliances shall be based on peace rather than war (Mosley, 2001: 321-322).