The following individual does not have a valid birth date and could not be added: Count of Holland Arnulf (I3182)
King William I The Conqueror (1066 - 1087)
King William II Rufus (1087 - 1100)
King Henry I (1100 - 1135)
King Stephen (1135 - 1154)
Queen Matilda (1135 - 1141)