This article attempts to critically adress the development of the relation between historical sociology and international relations theory. It evaluates the main stages of the historical sociological approaches in IR and the main issues of contention. Historical sociological approaches to IR have evolved from a Weberian stage in 1970s and 80s to a point where it is heavily dominated by historical materialist approaches today. The focus of these debates is to develop a historical materialist undersanding of the "international" so far dominated by ahistorical and positivist conceptions. The article discusses the relation between capitalism and the state system and the concept of uneven and combined development (UCD) as the major points of discussion within the historical materialist historical sociology The article concludes by adressing some of the crucial issues of contention for the future development of a historical sociological analysis of IR.