"German King" . . "Otto IV of Brunswick" . . "Otto, Duke of Brunswick" . . "Emperor Otto" . . "emperor Otto IV" . . . . . . . "Otto IV of Welf" . . . . . "King Otto IV" . . . "1218" . . "Otto the Proud" . . . . . . "Otto IV of Germany" . "Otto of Poitou" . . . . . . "Otto IV, Holy Roman Emperor" . . . . . "King Otto" . . . . . . . . "Emperor Otto IV" . . . . "Othon IV of Brunswick" . "Otto of Brunswick" . "Otto IV" . . "Otto" . . "Otto IV, Holy Roman Emperor" . . "Otto of Braunschweig" . "Otto IV" . . "Holy Roman Emperor Otto IV" . "1209" . . . . "Otto_IV,_Holy_Roman_Emperor" . . "Otto IV, Holy Roman Emperor" . . . . .