» Sat May 28, 2011 4:09 am
The bloodline of the Emperors being termed "Dragonborn" branched off into obscurity, but it's generally considered to be Tiber Septim's lineage, and thus any Emperor of Cyrodiil that is "of" is lineage is called a Dragonborn.
This is a little iffy however, because if you delve into the lore you'll find that Tiber Septim's lineage weered off from the current Emperors, even Uriel Septim (and thus Martin Septim) do not technically have Tiber Septim's blood (just his family name) and so they're not really 100% Dragonborn.
I hear you saying, "well if Martin Septim isn't Dragonborn then wtf about Oblivion's ending and all that!?", there's no real answer to that. A wizard did it? It's an unsolved part of the lore, what most people say is that the dragon blood in Tiber Septim's veins is figurative of his magical standing so to speak rather than his actual literal blood, and so his family relatives (that are not also his direct descendants) would have it too.
In Morrowind the term Dragonborn is used to describe someone who hails from Cyrodiil/is part of the Empire, it doesn't mean that they all actually have dragon blood like some of the Emperors do. It just means they are under the sway of the Dragonborn as far as I gather.
The trailer of Skyrim can have several meanings thus, it can be that the Dragonborn from the trailer is an heir to the Emperors of Cyrodiil, or a direct descendant of Tiber Septim (or both), it could also mean it is someone from Cyrodiil (highly unlikely in my oppinion) or it can mean something else entirely; namely that it's not really Dragonborn, as much as simply dragon born(e).
A person who has a dragon in his or her lineage, half or part dragon, or with the blood of a dragon creature (as opposed to a dragon god like Tiber Septim has) in his or her veins. This is the most likely scenario to me, especially as it looks like to me on the tapestry from the trailer like the "dragon born" person is breathing fire.