Yes...

[Diarmuid also knows the feeling, though his voice holds no bitterness. Instead, it just sounds sad. When he had first arrived, he had believed and wanted to believe. Things were so much like his home that it was comforting to believe. Comforting to think that these people believed in everything he did and would allow him to finally live in the way he had always wanted to...

Of course, there is always a time when a dreamer must awaken from their dreams, and even if Diarmuid wanted to keep believing, he is also the kind of man who cannot ignore evidence when it is shoved in his face...

Lets just say he has heard some pretty damning evidence now...]

I would suggest the libraries of the castle and a place called the Barrel. Both hold a great deal of information. In addition, the man who runs the Barrel is a very knowledgeable man who will be very glad to answer any questions he can.

[He's also the head of the neutral side, but that isn't something Diarmuid is going to say out loud. Not in the middle of Caer Glaem.]

Also, talk to others. We are all in the same boat here. Some may not wish to speak with you, but many others will.