 The third principle was to avoid becoming involved beyond the frontiers of the regnum Francorum or to do so when absolutely necessary and then not for the purpose of conquest”.This is important to the development of medieval history because without such a military organization and without a grand strategy, the Carolingians would not have successfully become kings of the Franks, as legitimized by the bishop of Rome.Furthermore, it was ultimately because of their efforts and infrastructure that Charlemagne was able to become such a powerful king and be crowned Emperor of the Romans in 800.