Definition & Meaning of "the power behind the throne"

What is the origin of the idiom "the power behind the throne" and when to use it?

The idiom "the power behind the throne" originated from the historical context of monarchy and royal courts. It is used to refer to an influential person or group who wields significant influence and control over decision-making, despite not being the public face of authority. All in all, the phrase symbolizes the idea that while a monarch or leader may hold the official position, there are individuals or factions who hold substantial power and shape the course of events behind the scenes.