You then need to read up on Alduin. Go http://www.imperial-library.info/ and search for materials relating to Alduin (who is Akatosh to the nords) to gain a better idea.
Yeah, alduin/akatosh is an interesting one.
i mean he is both loved and revered by pretty much all the races and nations of tamriel, they all have some version of him.
i have been giving this a bit of thought lately, and perhaps the dragon born is just a general title given to some messiah reincarnate.[aldu-rine?]
i mean you have to notice that its a reoccurring cycle in tes games to have people just plain live forever. or get reincarnated.
say for instance that the nerevarine was actually an aspect of azura. St Nerevar was the [Azur-ine?]
they are mortal emissaries of their respective aedric/daedric-gods, like the shezzarine [which i hope is important..love hearing about lorkhan]
[also..i just added so many words to my browsers dictionary....tes lore is now relevant to my spellcheck.]