What approaches are used by rulers to gain legitimacy?

Legitimacy is commonly defined in political science and sociology as the belief that a rule, institution, or leader has the right to govern. It is a judgment by an individual about the rightfulness of a hierarchy between rule or ruler and its subject and about the subordinate's obligations toward the rule or ruler.

Rulers getting this by, tradition (social order to live, that's the way it's been), Power of personality (when public support with charisma and leader ship), Following the rule of law (Lon order create a sense of trust).