Board Thread:Lore Discussion/@comment-24810427-20140107220735/@comment-4705438-20140108014331

So did the Septim bloodline really end? It is generally believed that it has ended, yes. The last known member of Septim bloodline was Martin Septim who sacrificed himself to end the Oblivion Crisis.

We saw partially revived Potema Septim in The Elder Scrolls V: Skyrim, but that doesn't really count, does it?