Urban Diplomacy: Cologne, the Rhenish League (1254-1257) and the Rhenish Urban League (1381-1389)

One of the distinctives of Rhineland cities of the central and later Middle Ages is their propensity to form leagues (Städtebünde) on their own initiative in the absence of strong imperial central authority. These alliances represent remarkable diplomatic collaborations between otherwise economic rivals in order to resolve conflicts and sustain the “king’s peace” (Landfriede) when the monarch was incapable of doing so. The inclusion of these regional and interregional Rhenish urban leagues into the historiography of European urban history has only recently begun in German-language medieval scholarship, yet it remains profound in its absence among Anglophone or any other western historiography on medieval urban history. This article seeks to address such an historiographical absence by introducing the subject within the context of this volume’s comparative, European-wide focus on medieval institutional structures, conflicts, and political culture. After situating the subject in its modern historiographical context, the two great Rhenish urban leagues (1254-1257 and 1381-1389) are studied, providing a further framing context for a close consideration of the Cologne-led Rhineland urban alliance of 1301-1320 directed against the elector-prince archbishops of Cologne, Mainz, and Trier. The sophistication of administrative, diplomatic, financial, military, and communication organs among the Rhenish cities in this period is extraordinary and thus provides additional insight into central and later medieval European political culture, conflict resolution, and territorial government. Medieval urban history thereby extends its landscape from that within the city walls to the pathways of diplomatic discourse between them.