As Falina already said, Pavak is from Dairsmuid, he just recently (as in the last week or so) left for the first time. He is an elven mage, and a thief, so the odds of he and Eresir not having had some kind of shady run-in is probably small. I know that I would love to do some backstory in Rivain, thus far its just been a big black hole in Pavak's history.
Let me know if you want to collab, I'm easily reached on MSN live: hollywithaneye [at] hotmail [dot] com!