Power behind the throne

The phrase "power behind the throne" refers to a person or group that is understood to de facto wield the power of a high-ranking official (for example, a monarch), or whose support must be maintained to continue in office. In politics, it most commonly refers to a nominal subordinate or advisor to an officeholder (often called a "figurehead") who serves as de facto leader, setting policy through their influence. A similar meaning is conveyed by the term éminence grise.