To assert that a 'clash of civilizations' follows inexorably from the different religious convictions at the foundations of Western Judeo-Christian and Arabic-Islamic cultures means to deny that a common political rationality can articulate genuinely universal, albeit culturally situated values. The eleven contributions to the present volume take up this controversy by challenging its premise that the heritage of classical Greek thought is exclusively part of Western political identity. By exploring the tradition of Platonism informing both Arabic-Islamic and Western political thought and intellectual history in key stations in their history, the contributors show how Platonic political theory can still bear fruit in the present day, especially in the context of dialogue between cultures.