What are the reasons for the weakness of royal power in France?

Royal power in France was greatly weakened after the collapse of Charles’ empire. In 843, the Treaty of Verdun was signed, which divided the country into three parts. After that, the strife intensified. The process of feudal fragmentation continued. Over time, the king practically lost his power, and the royal domain was very meager. Large feudal lords sometimes possessed more extensive holdings and strong armies. But since the 11th century, French kings have slowly begun to regain their influence.