Prince Robert Philippe Louis Eugène Ferdinand of Orléans, Duke of Chartres (November 9, 1840, Paris – December 5, 1910, Saint Firmin) was the son of Prince Ferdinand Philippe, Duke of Orléans and thus grandson of King Louis-Philippe of France. He fought for the Union in the American Civil War, and then for France in the 1870 Franco-Prussian War. In 1863 he married his cousin Princess Françoise of Orléans in Kingston upon Thames - she was the daughter of François, Prince of Joinville. In 1886 he was exiled from France.