Well, I was thinking either it's the Fifth Blight (And thus before the whole Mage-Templar War) or just during the Inquisition. I'm a bit torn between the two. On one hand, I feel that fighting against the Blight would be the most fun as we can pretty much play throughout Origins but with different characters, but doing it during the Inquisition gives us more enemies we could kill and a larger field to play around in (Instead of just Fereldan). I'm personally leading towards the Inquisition only because my Grey Warden would fit best there.