"Internal politics. Some concern about my sugar. I thought about refusing the recall. But they have members of my family back in the capital. I'm afraid it may have something to do with the problems with the succession. As the Emperor's health declines, factions are maneuvering for advantage. I may be gone a while -- that's why you're promoted to Operative."
Now take a quick trip over to Ebonheart and ask some of the locals about the Unrest in Cyrodiil City:
"Uriel Septim is sick, and wizards say his heir, Geldall Septim, and the younger Septims, Enman and Ebel, are just doppelgangers placed in the household during Jagar Tharn's tenure as Imperial Battlemage. They say the Guard charged a mob demanding destruction of the false heirs... lots of folks were killed."
Now comes TES IV. Uriel VII has died. The palace guards try to hold back yet another angry mob. But the strength and number of the people are too great. The guards are overwhelmed. The gate of the Imperial Palace is smashed and the angry crowd floods into the palace. Geldall, Enman and Ebel are killed. We will never know if they were the true sons of Uriel VII or if they were indeed Tharn's co-conspirators. Now the only thing that can be done is to find Uriel's bastard son! That will be quite a task, since Calaxes Septimhttp://www.imperial-library.info/content/morrowind-lady-benochs-words-and-philosophy was supposedly killed in the Temple of the One thirty-five years ago. I say supposedly since his assassination has always been but a rumor. And if Calaxes is found to be alive and is crowned as the Emperor, would he fight to keep the Empire together? Or rather, would he establish a Theocracy in its place, as he advocated before his "disappearance"?
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Why are you looking at me like that? Oh, right. Lemme see, from the start, Uriel VII http://www.youtube.com/watch?v=GpMjakNhZTc, his children were killed by
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Basically, it makes sense for this "Dovahkiin" fellow to be Tiber Septim, just like it made sense for Cyrodiil to be in complete chaos or for Calaxes to be Uriel's bastard son (in TES IV's plot). But the track-record for sensical continuity isn't too impressive. As such, I very much doubt that Dovahkiin will be Tiber, or a reincarnation/avatar of Tiber. My money is in D-kiin being a whole new, never-before-seen character, like that-guy-whose-name-isn't-as-cool-as-Calaxes.
And I really hope that I'm completely wrong!