The following individual does not have a valid birth date and could not be added: King of Sweden Ohthere (I8619)
King Edward The Confessor (1042 - 1066)
King Harold II (1066)
King William I The Conqueror (1066 - 1087)
King William II Rufus (1087 - 1100)
King Henry I (1100 - 1135)