The third edition of this accessible and popular text presents International Relations (IR) arguments and ideas in historical context. It shows how international events spark discussions about war, wealth, peace and power and how these discussions in turn fuel the rise of theories. The book traces international theories across the centuries - from medieval times until present day - and shows that many old ideas live on and continue to affect the way we perceive world affairs today ... This book tells the story of IR. It shows how major events shaped particular theories and how these theories often reflected the concerns of the Great Powers of days past. Yet, it also makes clear that although the world has changed a good deal over the last 500 years, some basic ideas have remained remarkably constant over time.