This paper will show how the history of the Mashrooteh (Constitutional) Revolution continues to shape - and be shaped by - Iranian politics by looking at why and how the memory of that defining moment in Iranian history has been invoked in public discourse since the 1979 Islamic Revolution. It will provide an analysis of the politics of re-reading and re-constructing the historical past by contextualizing the various interpretations of Mashrooteh history and their chief proponents. To do so, newspapers, magazines, speeches, events, and political campaigns from three different periods will be consulted: the period of revolutionary crisis from 1979 to 1983; the Reform Movement of the late 1990s and early 2000s; and the post-Reform era. Ending with the 2009 Green Movement, this paper will tell a thirty-year political history of Iran by recounting the battles over the history of the Mashrooteh period fought by various political actors during the same period. Beginning in 1979, I will show how Mashrooteh history became one of the main battlefields of the post-revolutionary power struggle. Consequently, I will argue, the new sovereign in the emerging political system was entangled in a particular (Islamist) reading of that history which, in turn, left it vulnerable to future historical revisions. I will then discuss the two most politically consequential revisionist accounts of Mashrooteh history which sought to displace the historical foundations upon which the bifurcated sovereign of the Islamic Republic was erected in 1979. By contextualizing the Reformists’ discourses of (neo)constitutionalism and what I call “Islamic republicanism,” as well as the “secular” interpretation of Mashrooteh history which became popular in the post-Reform era, I aim to shed light on the intricate ways in which history and politics are entangled in contemporary Iran. I will, therefore, argue that disputing the past in post-1979 Iran functions as a means of contesting the present. In this context, therefore, revolution becomes not only the ultimate political act, but also the ultimate act of historical revision through which the monopoly over the legitimizing fountain of history is transferred from one political group in society to another.