Answer:
They all used the idea of the Divine Right of Kings. And, to avoid any riot or political enemies, they isolated the local aristocracy or tried to use the aristocrats as allies.
Step-by-step explanation:
The idea of a Divine Right was proposed, for the first time, by the 17th century theologian Jacques Bénigne Bousset. Even if this conception was not something new in Europe - British monarchy follows this statement since the 10th century, it was the first time this conception became written law. According to him, kings have a power that was given by God. Thus, the monarch didn't need to give explanations about his actions but for God. The monarchies that emerged in Europe were possible by the Absolutis: the absence of a power division, and there were no citizens, but people who were under the divine rule of a monarch elected by God.