To make things more complicated, the prince should have a separate door as well. It's located on the other corner of the inner courtyard, and it's now the entrance to the tourist office. You can see two doors here as well, for the two royal children. The fun part is that the two doors lead to the same staircase. The doors suggest real 'separate' entrances, as you can't see from the outside that they lead to one and the same stairs.

