The South is a wilderness of warring barbarian 'kings', raiding bands, bandits and other such creatures. Like every good citizen of the Imperium, Dorian Pavus despises the very thought of the place and all those savages who inhabit it, probably all sweaty and half-naked and... sorry, lost his train of thought for a moment there. Of course, most good citizens of the Imperium haven't just been captured by a group of said southern barbarians. (AU in which Hawke leads a raiding band, Dorian is the prize all his men are fighting over, Varric stands to make a lot of money off the betting pool, and Trevelyan is not the Inquisitor, he's a very naughty boy)

Everyone knows that there are no free mages under the Qun. The Ben-Hassrath know that there's nothing more useful than a fact that 'everyone knows'.