The lavatory contains a long trough for which the knights can use for urination. Crude toilets are also included for defecation. The design is all stone walls with candles, and no privacy walls.
Lavoratory, Inside Castle
king
servant
I come from the lower class. I do what I am told without question. I can not read. I have not seen my family in a long time.
How do you do today, your majesty? Very well. Tell me, what is your duties here. Just cleaning the lavoratory as I am told, then doing the rest of my chores.  I see. My knights are a reflection of me, I expect their quarters, even the lavoratory, to be spotless. Understand? Of course, your majesty. I have served you for long enough to know that! Wonderful. There is a lot to be done and I know a fine subject like yourself will see it happen. I swear to you that I will work diligently! Are the knight's suits ready and their horses tended to?  Yes, sir! All shined and oiled, and the horses fed and ready! And tonight's feast needs to be perfect. The queen has been under the weather and could use a good meal. Of course, I'll make a hearty warm meal for her to feel better. Perhaps a beef stew with red wine? Excellent. I have big plans for tomorrow, and I will make our neighbors respect my god given authority...Hmm, I am not sure why I concern you with these things.