Alistair Coumi actually has a cast page, in case you forgot about him! He didn’t really mention he was friends with Gregor either, though.

↓ Transcript
<Halen sits down while reading the rest of the letter>
Halen: <thinking> She writes that she knew him in Goldhaven during the turmoils, when the Guild fought for its independence there ... that's right, he told me that! He and his friend ... "Alistair Coumi"? Hm, I think he mentioned him once or twice ... but what is this about them doing ... no.
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Halen: <thinking> No. This CAN'T be true. Gregor wouldn't do such horrible things to win ... would he? It ... WOULD explain a lot, though ... if Lady Violet makes this public they're going to chase him out of town, in the BEST case!
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Halen: <thinking> But maybe ... maybe she is just making this up and he has no way to disprove her? But she wouldn't dare to do this if she didn't actually have SOMETHING ... oh Gregor, what have you DONE?
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Halen: <thinking> But ... but why would he even keep this ... this NASTY piece of paper? So CLOSE to him? Wait, here's another note from her at the end:
"You are going to show me this letter every time we meet, Gregor, so I can be sure that you are never going to forget about it."
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Halen: <thinking> "See it as a reminder that your faggot ass belongs to me, forever."
That ... that ... BITCH!
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Halen: <thinking> I ... have to do something. I have to confront him about this. But ... but HOW? Spirits lend me strength ...