Prince Pierre, Duke of Penthièvre
... that Prince Pierre, Duke of Penthièvre, fought for the Union Navy during the American Civil War even though he was French royalty?
... that <b id="mwB1w"><a class="mw-redirect" href="./Prince_Pierre,_Duke_of_Penthièvre" id="mwB10" rel="mw:WikiLink" title="Prince Pierre, Duke of Penthièvre">Prince Pierre, Duke of Penthièvre</a></b>, fought for the <a href="./Union_Navy" id="mwB14" rel="mw:WikiLink" title="Union Navy">Union Navy</a> during the <a href="./American_Civil_War" id="mwB18" rel="mw:WikiLink" title="American Civil War">American Civil War</a> even though he was <a href="./House_of_Orléans" id="mwB2A" rel="mw:WikiLink" title="House of Orléans">French royalty</a>?