[Richard Holmes, a local historian in Derry, New Hampshire, once traced John Kerry's maternal lineage to an Irish immigrant, Reverend James McGregor, who is thought to have planted the first potatoes in America. Holmes also found a distant relationship to another American potato-lover: Britney Spears. And according to Burke's Peerage, Kerry "is descended from Henry II, the king of England and father of Richard the Lionheart."]