User blog comment:Jimeee/Dragonborn DLC trailer released./@comment-4557996-20121109021611/@comment-3186827-20121109145002

Tiber was not a Nede. He was a Breton or Atmoran depending on what history you believe.

Alessia was the first Dragonborn Emperor. This could be used to explain that this is not the same as the first Dragonborn.