Under the Merovingian Dynasty (481 AD-751 AD) in early medieval France, royal political assemblies were used to fulfill a wide variety of functions of state. More importantly, however, they served as the primary venue for interaction between the king and the noble class he ruled over. Throughout the period, kings and nobles used assemblies to shift the balance of power in their own favor. Sometimes, by using regencies of young kings for instance, aristocrats managed to gain power over their rulers. Others, kings managed to shift the balance back and reassert their full authority. The Merovingian kingdoms moved through cycles of waxing and waning levels of centralization. When a king died with multiple potential heirs, the kingdom was often split into three or four separate political units. At these moments, the kingdoms were divided and decentralized. When a king’s brothers and his heirs died, however, the kingdom reconsolidated into a single unit, requiring greater centralization to govern. In these moments of centralization, the power struggles of assemblies offered more permanent gains, which the aristocratic class exploited to gradually increase their relative status, until the distribution of power reached a point where the forbears of the great king Charlemagne managed to replace the Merovingians and become kings themselves. The effects of assemblies on Merovingian government and kingship allowed and led to the birth of the Carolingian dynasty. More even than this, the very fact that the Carolingian's used assembly politics to attain power affected how they in turn governed, thus shaping the history of Europe for centuries to come. Using close readings of narrative, legal, and formulary evidence, I argue both that Merovingian assemblies functioned as an outlet for royal-aristocratic competition, as well as the increased impact this competition had during centralized moments in Merovingian history.