Two theories I posted in an earlier thread on possible continued lineage of the Dragon Blood:Now that the "official" branch of the Septim bloodline is spent, I have considered two potential heirs:
Hjalti Early-Beard & His DescendantsAccording to
The Arcturian Heresy, Tiber Septim was a Nord by the name of Hjalti Early-Beard. It is possible that he may have descendants up in Skyrim who can trace their ties to Tiber Septim, if this claim is indeed true. If it isn't, well, it may still be worth looking into if the Empire has no other good leads.
King Lysandus & His Son King GothrydKing Lysandus died before the events of Daggerfall. However, one of the Underking's agents during the Main Quest says,
"not even death can hide a true descendant of Tiber Septim from the Underking". This refers to Lysandus. Now, it may just have some other metaphorical meaning, but I doubt it, seeing how the Underking was (at least partially) Zurin Arctus, Tiber Septim's Imperial Battlemage. I doubt he would have reason to lie about this sort of thing. Who knows? Maybe Tiber Septim had a bastard child, whose descendants fathered Lysandus - a child whom only Tiber Septim's closest allies, including Zurin, would know of.
King Lysandus' bloodline lives on through his son, King Gothryd of Daggerfall. At the time of the writing of the
3rd Edition Pocket Guide to the Empire, I believe it makes a remark somewhere that him and his spouse, Queen Aubk-i, are still alive and beloved in their kingdom.