This article uses a long view of history to examine structural realist
ideas about international system. It has three themes: (1) that insuf
ficient thought has been given to defining the necessary and sufficien
t conditions for saying that an international system exists; (2) that
such conceptions of international system as we do have are overwhelmin
gly biased by the structural characteristics of the European experienc
e; and (3) that international relations theory and history need each o
ther. History provides a wealth of significant challenges to prevailin
g orthodoxies in international relations theory, and structural realis
t theory can be used as an interesting approach to formulating grand h
istory.