The challenges of nuclear proliferation, conflict and terrorism, poverty and inequality, climate change and the deteriorating environment, are inextricably linked in our current world, and can only be tackled by a broad and unified effort to achieve peace in its fullest sense. Yet the perception of peace is much less vivid in popular imagination than that of war, and the growing body of serious peace studies is less accessible than it should be. Peace is often written off - especially by war historians - as a difficult concept to define, as a dull subject compared to war, or simply as ‘the absence of war’, a mere interval between wars which are claimed to be the driving motor of history. In my new book, The Glorious Art of Peace: From the Iliad to Iraq, I argue to the contrary that from ancient times onwards there has been a rich discourse about the meaning of peace and how to secure it, that there is a wealth of ideas and debate which continues to be relevant, and that The Art of Peace is as complex as the Art of War. Human civilisation could not have developed without long periods of productive peace, which have allowed for the emergence of stable agriculture, the growth of urban society, and the expansion of peaceful trade and intercourse between societies. Peace, as the great humanist thinker Erasmus (1466-1536) put it, is ‘the mother and nurse of all that is good for man’.