If Louis VII's son Philip dies in the womb, this exposes the lands of the French Royal Demesne and the throne to conflict among the leading noble houses in France on the death of the old king in 1180. Lets say as Henry II of England, with the combined resources of his various realms, invades Ile-de-France and captures Paris, at the expense of Robert I Count of Dreux (Louis' brother) and perhaps Hugh III Duke of Burgundy. Would the union of the French and English crowns long survive his death? How likely is it that this unified monarchy survives with people like Henry the Younger (barring any tourney accidents) Richard of Aquitaine, Geoffrey of Brittany and John Lackland succeeding Henry Curtmantle?