From what I've read, he was actually dalish, but left his clan. If i recall, he said that his clan wouldn't do what the Virnhen clan did (summoning Ishmael).
I question if he was actually Dalish:
He dodges the question when Briala asks him outright if he's Dalish. He even threatens to not help her if she forces him to answer that question
He condescends the Dalish in general, though he approves of Briala helping the city elves.
He seems to know far more about the elves of Arlethan than anyone else.
Imshael recognized him and even seemed familiar with him.
My suspicion is that he may have been a Dreamer awakened from uthenera, contemptuous of the Dalish who claim to be the remnants of the elven empire he was in fact a part of.