If you consider that in the medieval period, the eldest son was the main heir to his father's estate, then you can't help but feel very sorry for poor Robert Curthose. As the eldest son of William, Duke of Normandy and Matilda of Flanders, he was already due to inherit Normandy in the future. In 1066 his father became King of England, and the teenage Robert would have been able to think of himself as the future King Robert I of England.
Category: Almost Kings
At the time of his birth in 1365 little Edward of Angouleme was the prospective King Edward V of England. Son of Edward the Black Prince, grandson of King Edward III, the little boy would have been expected to follow in his forefather's military footsteps – batter the French and help reclaim the lands of the Plantagenets.