I was thinking prisoner at first which seem like quite a common choice but why give a window to the prisoner. The drainage thing does seems like a toilet of some kind which is also a common choice. So it seems like a place for someone to spend and the window a long time enough they have to do the business there. 
So, I believe it's some kind of sentry post/guard post/observation post.

Hello!

I hope you can go to the HiveFest and I hope to be able to go to one someday, but it won't be this one. 

As for the question of the contest, I'll say the room is a bath and the picture is about what was used as a toilet. It has a drain, and I guess next to the window to mitigate the odors;)

Happy weekend!

Steam room

I believe this should be a bathroom because i can see the drainage where the water will pass through and then you need a window for sunlight to enter

I'm also going with toilet, bathroom, restroom, call it as you like, but it looks like it's been used for 💩😂

Firstly, thank you for your last gift, it's much appreciated.  

Secondly, to my guess:  it's a dungeon.  I'm late to the party because, well, life happens!  Hopefully, better late than never!

Congratulations @livinguktaiwan! You received a personal badge!

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Visiting Clifford's Castle have you? 

Toilet of grand design fit for a king to flush his pandemonium down at the end of days errands, long before these actually came to town.

Having visited, this was fun reminder, how lucky they were..., in London town they flushed straight onto the streets, watch where you walk!

@LUV - The history mystery.

I think it should be a men's bathroom. If it were for women they would have to add a lid for the ladies to sit on. 

I think it's the latrine, privy, toilet. I don't know what they called it back then but you get the idea. That's my guess 😁 

Que éxito tener tanto HP en su cuenta, felicidades. 

Si se lo propone claro que irá a ese evento, que por lo que veo es una gran inversión la que va hacer. 

Viendo esta habitación concuerdo con mucho de los comentarios, que es el lugar en donde personalidades importantes del castillo iban hacer sus necesidades fisiológicas.  

Las reglas para que se fueran los desechos que salen del cuerpo y la ventana que se hacía alargada y hacia afuera de la habitación, para que se fueran los malos olores y no ahogarse con ellos.

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What a success to have so much HP in your account, congratulations. 

If you put your mind to it, of course you will go to this event, which from what I see is a great investment you are going to make. 

Seeing this room I agree with many of the comments, that it is the place where important personalities of the castle were going to do their physiological needs.  

The rules to get rid of the waste coming out of the body and the window that was made elongated and out of the room, so that the bad smells would go away and not drown with them.

Wow! This contest is amazing and it drives engagement with HPUD, would you be up for making a similar one for LPUD @livinguktaiwan?

I’m here… and didn’t forget 😎👋🏻
It’s a bathroom… primitive toilet 🚽 

Happy power up day and congratulations on your growth!

My first thought was a bathroom or a loo, but I'm going with bathroom.
PS I purposefully did not read the comments but see that's what most of us are saying, although there's no space to swing your arms and do acrobatics to reach your back! I wonder what tool they used for that! 👀

This's probably a bathroom or a shower of some sorts hahaha

I saw similar rooms in some medieval castles when I travelled across Eastern Europe. They probably had some kind of water system back in the days, and then the ...hm... "dirty water" went throught the metal grille.

It looks like a bathroom??

This room was maybe called garderobe - actually a primitive toilet? :D

It's a bathroom, lavatory, gaderobe. Used as toilet or bath. 
If that is what it is then it's too easy 🌚

The guardsmen spent a lot of time defending the castle from the Zombie hordes, during the year of 1215. Simon Pegg, take note as this would make a good comedy film, medieval battle meets Zombies, you get the gist..... anyway back to the actual history (I am not making this up, not honestly), they'd need to take a pee every now and again whilst actively still shooting arrows at the invaders. This won't be the actual answer so I thought I'd go for absurdity instead!

We have a lot of these medieval castles here in the Czech Republic too and I think these rooms served as the bathrooms / toilets back then :) You said it would be difficult this time so I´m a bit confused but still sticking to the toilet as my answer! :D

Thanks for hosting this fun challenge and congrats on your impressive growth here on Hive!