I have reason to believe that Mesaana is Verin Mathwin. Some may think this a crazy idea, but I have seen more unlikely ideas on this theory page. In support of this I bring attention to how much Mesaana had wanted to be a teacher. In the prolouge to LoC, Graendal taunts her into thoughts of when she wanted to have a place in the Collam Daan, but she was denied and was only allowed to teach. This shows that she has the perfect background to be of the Brown Ajah. Next clue, she is stationed in the White Tower. This is also shown in the prolouge when the Forsaken question her about the access of the angreal's and sa'angreal's in the Tower. If the Forsaken questioned her about the access of them, that means she most likely had taken angreal's before. Think back the the infamous ring Ter'angreal that Verin gave to Egwene. Verin had said that she used the ring once, and I really doubt that a Brown would pass up the chance to study Tel'aran'rhiod, unless this certain Brown already knows everything there is to know about Dreamland. I only think she gave the ring to Egwene because somehow it fits into her plans for Rand. The only thing that I believe throws my theory out of whack is that Verin has been plotting for over 70 years. The Forsaken have only been out for a short time. The only Forsaken that is thought to have been out of the Bore before recently is Sammael, which leaves some space for my Theory. Maybe Mesaana was made free from the Bore long before any other of the Forsaken. I hope to get alot of feedback from everyone else on this idea so I can see if I really missed something and caused my theory to look really stupid.