For urban historians and urban historical geographers, the relevance and meaning of the city as a driver of human history is central to what we do, both theoretically and empirically. For some, the question of how to define what a city does is a pressing one. For many of us, though, the question is rarely raised; it resides in that murky place behind our writing and thinking, and has little direct or conscious play over how we go about doing our daily work. Historical geographers, with their greater emphasis on theory and spatial relations, are more likely than historians, trained as they are to think through narrative, empirical evidence and temporality, to explore the city's role in explaining social change. Despite this difference, the fact remains that only a handful of urban historical scholars of whatever stripe are actively interested in thinking through the scope and significance of urban agency. The fact that few openly grapple with the question of urban agency, of course, does not mean that we do not work with some understanding of the city's ontological status. All of us do, for better or worse.