Board Thread:Lore Discussion/@comment-85.74.137.231-20130605091958/@comment-9421524-20130610210338

The Greybeards, or Arngeir says about potentially multiple Dragonborns. A guard after you kill your first dragon says about never hearing about Tiber Septim killing any dragons, and another guard says about there not being any dragons then. Paarthurnax says that you have the "Dovah Sos" or Dragonblood, and we are no emperor, so all Dragonborns must have Dragonblood. Miraak, being "The First Dragonborn", proves that other Dragonborns have existed and could shout. My basic point, however, was that The Dragonborn emperors more than likely could shout, but due to the lack of dragon souls (which initially enable the Dragonborn we play as to shout in the first place), it could never be demonstrated by them.