User blog comment:Knight of Camlorn/Elder Scrolls Online: Emperor Concept Art/@comment-4662333-20131219145818/@comment-17114085-20131220032826

Yes there is, the Akaviri have been in Tamriel since the Second Akaviri invasion. Some of the akaviri that stayed became the dragonguard, some were affiliated with the Emperor/Empire and after the end of the Reman Dynasty became the Akaviri Potentate. I believe the Blades were started sometime during the Septim Dynasty but I could be wrong.