Liberté, égalité, fraternité was a saying in France. Tourette quoted it to some Americans in a pub in 1799. Raphael told the Seventh Doctor that his superiors in the Shadow Directory were "quite keen" on the principles of equality and fraternity. (PROSE: Christmas on a Rational Planet)
When the Pageant was experimenting with history in late 18th century Paris, the Three Graces of Liberty, Equality, and Fraternity were the only members to stay dignified and refrain from dancing. (PROSE: The Man in the Velvet Mask)