The royal bathroom is a stone room with a long wooden bench and several holes and seats for royalty to take care of business.  There are some tapestries depicting rural landscapes hanging on the walls to give people something to look at.
Royal Bathroom, Inside Castle
king
guard
I guard the castle.  I guard the king.  I would kill to protect the royal family.
my king! My guard! Why are you yelling at me while I'm taking a royal poop? Your shit stinks really bad, your highness. What have you been feeding on? Kingly feasts. Careful, sir. The overlords in our fair land don't like profanity, and may take it from your pay from the treasury. This is a mouthful while in the privy. Anyway, this intrusion had better be worth something. Why have you disturbed me? Have you news? I was asked to inform you that the captains and general are awaiting your presence, my king Well, this is one of those "could take a while" or "I could take a break and come back" poops. How urgent did the captains and general seem? Keep in mind, my last feast was extra regal!