droit de seigneur
The supposed right of a nobleman to deflower the bride of any of his serfs on their wedding night. The phrase, which translates as “the lord's right” was also known as “the law / right of the first night.” Despite its widespread appearance in popular culture, reports of the “right” having been exercised are very rare. It was more a representation for or a warning about the power that a feudal lord could exert over his tenants. Mozart's opera, The Marriage of Figaro, involves Count Almaviva's efforts to exercise his right with Figaro's bride, Susanna. The phrase survives as a seldom-used metaphor for unlimited authority over another, such as a boss over an employee, notwithstanding the gender of either party.