Board Thread:Lore Discussion/@comment-10993011-20140918001226/@comment-17114085-20141117101216

You don't need to be a descendant of Alessia, as proven by the fact that Tiber Septim and his line had no relations to Saint Alessia. All you need to be in order to wear it is a Dragonborn or a descendant of one, as it seems that Dragon-blood is hereditary.

Also being Dragonborn isn't hereditary, in-game books confirm it: ''Because of this connection with the Emperors, however, the other significance of the Dragonborn has been obscured and largely forgotten by all but scholars and those of us dedicated to the service of the blessed Talos, Who Was Tiber Septim. Very few realize that being Dragonborn is not a simple matter of heredity - being the blessing of Akatosh Himself, it is beyond our understanding exactly how and why it is bestowed.'' Being Dragonborn means you have the soul and blood of a dragon. The Septim Emperors, excluding Tiber Septim, were likely all just dragon-blooded.

Katariah was crowned Empress, meaning she must have gone through the ceremony to relit the Dragonfires. The Dragonfires went out after her husband's death, which is why she was only crowned Empress after his death and remained only a Regent while he was still alive. That ceremony requires the person to wear the Amulet of Kings, which can only be worn by someone who is either a Dragonborn or Dragon-blooded. We know for a fact that the Dragonfires were relit, or else an Oblivion Crisis would've happened, so we know she must have worn it.