The Nuttall Encyclopedia
A large reception-room in the palace of Versailles, lighted by a window so called (ox-eye it means), and is the name given in French history to the French Court, particularly during the Revolution period.
Wood, James, ed. Entry for 'Oeil-de-Boeuf'. The Nuttall Encyclopedia. https://www.studylight.org/encyclopedias/eng/nut/o/oeil-de-boeuf.html. Frederick Warne & Co Ltd. London. 1900.