Meaning of the word "the power behind the throne" in English

What does "the power behind the throne" mean in English? Explore the meaning, pronunciation, and specific usage of this word with Lingoland.

the power behind the throne

US /ðə ˈpaʊər bɪˈhaɪnd ðə θroʊn/
UK /ðə ˈpaʊə bɪˈhaɪnd ðə θrəʊn/
"the power behind the throne" picture

Idiom

a person or group who secretly exercises power and influence over a leader or government, without holding an official position

Example:
Many believe the queen's advisor was the power behind the throne, subtly guiding her decisions.
Despite not being elected, the party chairman was widely seen as the power behind the throne.