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
servant
knight
I am a knight in the royal army. I am strong, brave and fearsome. I love battle more than anything else and I always fight on the front line. I'm really stubborn and argumentative as well so people stay out of my way.
Servant I need you!  What is it you need, my liege! Why is this place so filthy even for a Lavoratory. That is why I am here. I was summoned by the King and he told me how bad it was. I just cleaned his private lavatory and it was nothing like this filth Well this really should've been on top of this. What? Pardon, I mean no disrespect, but you knight's are filthy when it comes to using the facilites to urinate and deficate. Pigs are cleaner, no disrespect. You're not allowed to speak that way You are not allowed to speak that way! I'm here to clean things up. And the king is my ruler and he tells me what to do. You just do what you do and that is fight wars for the king. Nay, I am still above you. Then you clean this mess! I'm going to tell the knight you were in my way and refused to let me do my work. I bet you would like to have a lavatory as luxurious as his. Maybe that is why you are so angry! I do not touch such things Then remove yourself from here and let me do my work. Go urinate outside and do as the bears poop in the woods. I will clean this place and be on my way.