Wikipedia: William, Count of PoitiersAugust 17, 1473 – Birth of Richard, Duke of York, son of King Edward IV of England, at the Dominican Friary in Shrewsbury, EnglandWikipedia: Richard, Duke of YorkAugust 17, 1786 – Death of Friedrich II (the… | http://www.unofficialroyalty.com/august-17-today-in-royal-history/