Okay, I don't see why that is "safe to say". They knew there was a dragonborn, one way or another. We don't know how they know this, but knowing it to be true is irrelevant because from what we know about Akavir, finding a potential DB is worth the trip. Perhaps they knew this from a divine or trustworthy source.

The dragonborn did not come from Akaviri, the Akaviri came to Tamriel searching for one.

Miraak was the first dragonborn. Ever. St Allesia whilst was given the blood was not a dragon'born'.

Saint Alessia was the one who made the pact with Akatosh. Those of their combined bloodline would all be Dragonborn; but not capable of absorbing dragon souls and having the inborn ability to Shout. All that was required was that you descended from Alessia.

However, being Dovahkiin in the sense of Miraak and OUR character, is different. We were hand picked by Akatosh to carry the blessing of his power and the blessing to truly kill his children; the Dovah. Dragons. We weren't (at least not NECESSARILY) descended from Alessia.

So, as I said. Alessia was the first Dragonborn. The first to carry the blessing and blood of Akatosh.
However, Miraak was the first Dovahkiin (I know that it's the same thing, but you get my meaning). He was the first Dragonborn that was capable of absorbing and permanently slaying a Dovah. Hand picked by Akatosh, just like us. Not descended from Alessia. Well, not necessarily anyway. He might have been, but it wouldn't matter in this sense.

" In response to confusion in the Bethesda Softworks Forums about the announcement of the first Dragonborn in the Dragonborn official plug-in who wasn't St. Alessia, Michael Kirkbride said: "Alessia didn't have the power to absorb dragon souls. Hers was a much more nuanced power: to dream of liberty and give it a name and on her deathbed make Covenant with the Aka-Tusk." "
from the UESP Wiki. http://www.uesp.net/wiki/Skyrim:Dovahkiin

See, thats why the UESP is superior over the wiki.
That article is half fanfiction.
Miraak dead? says who? He found a Black Book? He used Herma's knowledge to defeat dragons?
Utter fanfiction.

Wait the wiki says that or UESP?

If I gathered correctly, and I usually do, Miraak never died. He was DEFEATED by the dragon army at his temple, but not killed. It was my general assumption, despite that there are no hardcoe facts on it, that Herma-Mora took him to Apocrypha to save him/trap him (just not telling him that part).

The wiki.

Ah yeah.
UESP seems to be fairly strict, anything that cant be backed up is swiftly removed.

The Dragonborn didn't come from Akavir, the Blades did. Alessia wasn't the first Dragonborn, for she wasn't truly a Dragonborn in the sense of a Dovahkiin. A more precise term would be "Dragonblooded". Not to mention the fact that Alduin and the other Dragons knew what a Dragonborn was, and even had their own word for it, "Dovahkiin", when they had been banished/dead thousands of years before Alessia was even born. So she obviously wasn't the first. Miraak was obviously a Atmoran/Nede.

The Tsaesci didn't come to Tamriel to find a Dragonborn, they came to conquer. You're probably thinking of the human Akaviri, whom were wiped out by the Tsaesci on Akavir.

No. Atmora is to the north of Tamriel. Over the years, it became colder and colder, until it was nothing more than a frigid wasteland so horrendously freezing cold that not even the cold-resistant Nords could live there any longer. Atmora is still there, it's just too cold to be inhabitable. It's essentialy the Antarctica of Tamriel.

Okay.

So he's most likely Nord/Atmoran/Nedic, like the Dragon Priest liches/draugrs.

BTW, how does he live for so long in Apocrypha? It's been thousands of years; even elves don't live for this long (except for immensely powerful mages like Telvanni Mage-Lords, like Baladas Demnevanni).

Time doesn't flow within Daedric realms like it does on Nirn, I don't think.

I don't know why so many of you are assuming that there wasn't any DB on Akavir. Who said that DB is Tamriel exclusive ? We don't know much of Akaviri and their continent, but surerly they have VERY VERY VERY great cultural connections to the DB. That said, I'm assuming, that at some point there was a DB on Akavir, it is that hard to understand ?

Assuming there wasn't is just as credible, if not more, than assuming there was when there are no records of their being Akaviri men with the ability to absorb dragon souls.

Ok, I will tell it another way. Why would Akaviri went to Tamriel in purpouse of searching DB ? Becouse their own is no more. If they know what the DB, and the big role that it have in their cuture, they must have meet one. As I said before, assuming that DB is Tamriel exclusive is foolish.

Why?
Tamriel is the Starry Heart, the Arena, the centre of the universe.
All life comes from Tamriel.
It is possible that the Akavir had legends of a Dragonborn, it is possible they had scryers who could view across the oceans, it is possible they had diviners who told them their destiny was on Tamriel, it is possible a god told em to go west.

Its a magical universe and seeking rational explanations doesnt work in real life history and it doesnt work doubly for TES.

Actually the snow elves did as well because knight-Paladin Gelebor has been around since the fall of the snow elves

from his accent I assumed Mexico.

Wrong. They were not searching for a DB in a sense, they stumbled upon Reman, saw his use of the voice and pledged to serve him in the manner of the blades if I am not mistaken.
There were no dragons active in that era, so there would have been zero need for dragon slayers. They were essentially looking for a purpose, someone to serve.

Come to think of it.. he does kind of sound like Caesar Milan, haha.

came from Todd Howard's brain..