So i've been getting back to the skyrim lore lately and theres one thing i'm still confused about. When the atmoran came to skyrim the first thing they did is killing the snow elves, but i've heard that the dragons have been ruling humans since the beginning. So my question is, wich is first, humans dealing the dragon menace or humans killing snow elves? Were the dragons present in Atmora?
Hopefully the background provided here will help. In summary, the Dragon War took place after Atmoran people came to skyrim. The Atmoran's created the dragon cult and those ancient nords were the ones enslaved by Alduin. So the events following the Night of Tears and Ysgramor's reconquest of Skyrim preceed the Dragon War.