I've read the series several times and am now going through them again after not reading them for a few years. I just finished Eye of the world again, and noticed that Moiraine was dead set that the Horn had to be transported to Illian.
Notwithstanding the events to come wherein it never goes to Illian and things worked out in the end, I don't recall any of the prophecies saying that it needed to be in Illian, nor really any connection between the Horn and Illian except the fact that Illian would call for the Hunt periodically and that's where folks would swear their Hunters Oath.
So is there something I missed in any of the books that indicate why Moiraine would state that it needed to happen?