Definition of Mayor of the Palace in US English:

Mayor of the Palace

(also Major of the Palace)

noun

  • A nominal subordinate wielding the power of his titular superior. Now historical.

Origin

Mid 16th century; earliest use found in John Rastell. After post-classical Latin major palatii and, in later use, Middle French, French maire du palais; compare post-classical Latin majores palatii palace dignitaries, and major-domo.