I'm working on learning the Creation Kit right now and have been thinking out a possible story for a quest or quest chain to go along with it.

Basically coming across an Acheologist who believes to have found something connected to the Dragonborn, turning out to be a secret building built for the purpose of blah blah blah I'm not that far yet. So I was wondering, how many dragonborn actually were there? I know that the line of Emperor's were all dragonborn, but were their others? There's mention of Mankar Cameron possibly being one since he could wear the amulet of kings.

I could of course have Tiber Septim himself having build the location to house some secret or weapon of some sort but I'd rather it be a possibly lesser known individual, simply my preference I suppose.