[quote=@babbysama]
Alanda, Spāhbed of the West, Marzbān of Armenia
[/quote]

I've went ahead and freed up Armenia, so it wouldn't belong to either Empire. My reasoning is that Armenia was only ever part of either Empire in a loose sense, and usually managed to be more or less independent due to the inaccessibility of the place. By the seventh century, due to the influence of Christianity, it was pretty solidly in the Roman sphere anyway.