As the son of a future King, Prince Louis is destined to receive a more senior title one day, but it apparently won't be the one that we all thought. There are certain titles that are traditionally bestowed on particular people in the line of succession.
The direct heir to the throne is made Prince of Wales and the monarch's eldest daughter often becomes Princess Royal. The second son is usually made Duke of York and yet eight-year-old Louis might be denied this.
