To legitimize means to establish something as legitimate, valid, or lawful. In the context of ruling dynasties, it refers to actions taken by rulers to validate their power and authority in the eyes of their subjects.
Related terms
Divine right of kings: A political doctrine that claims monarchs derive their authority directly from God.
Succession: The process of transferring power from one ruler to another according to established rules or traditions.
Hegemony: The dominance of one social group over others through cultural influence, economic power, or military force.