User blog comment:Jack Pistol/The First Dragonborn?/@comment-108.195.32.180-20121223045901/@comment-108.195.32.180-20121223181130

""  Skyhaven Temple and the "Dragonguard" were built during the first akavir invasion in the merethic era -- well before Alessia. ""

Actually I'm wrong about this comment -- sorry. There are actually no in game texts that tell when Skyhaven was built. For that matter, there are also no in game texts that tell who it was built by. However, skyhaven temple is nordic architecture. So it may not have been the akavir who built it at all.

I also believe the first akavir invasion was first era. WHOOPS. But my other points still stand.