Maybe the First Dragonborn was Jhunal? A long forgotten Nordic God of Knowledge and Hermetic Orders...
Uesp says he becomes Julianos in Imperial pantheon, I think he fits...
Often associated with http://www.uesp.net/wiki/Lore:Gods_J#Jhunal, the http://www.uesp.net/wiki/Lore:Nord father of http://www.uesp.net/wiki/Lore:Ehlnofex and mathematics, Julianos is the Cyrodilic god of literature, law, history, and
contradiction[lorkhan?!?!?!]. Monastic orders founded by http://www.uesp.net/wiki/Lore:Gods_T#Tiber_Septim and dedicated to Julianos are the keepers of the http://www.uesp.net/wiki/Lore:Elder_Scrolls. Julianos' symbol is a http://www.uesp.net/wiki/File:Daggerfall_Signs_School_of_Julianos.png. Julianos created the http://www.uesp.net/wiki/Oblivion:Shield_of_the_Crusader for http://www.uesp.net/wiki/Lore:Pelinal_Whitestrake, to help him defeat http://www.uesp.net/wiki/Lore:Umaril_the_Unfeathered.