The Prince's Flag (Dutch: Prinsenvlag, German: Prinzenflagge) is a Dutch historical flag, originally used by the Dutch Republic during the Eighty Years War, as observed during the first battle of Den Briel. The Prince's Flag is based on the Flag of Prince William of Orange-Nassau, hence the name. The colours are orange, white and blue, which is why the flag is often called oranje-blanje-bleu (or even: ranje-blanje-bleu) in Dutch, and orange-weiß-blau in German. The colour orange represents the Principality of Orange which Prince William inherited from René of Chalon, the white stripe represents the struggle for freedom and supremacy, and the blue colour is the signature colour of the former County of Nassau.