Why did the Frankish kingdom become an empire?

The Frankish kingdom became a powerful empire in the Middle Ages thanks to the competent management of the members of the Merovingian dynasty. Clovis became the first king. He took actions that contributed to the unification of individual tribes and cities under a single authority. He strove for the centralization of territories and power. The Franks managed to create an empire because many climatic and social conditions were available to them. They quickly developed a feudal relationship. The state grew after the adoption of Christianity.