Board Thread:Lore Discussion/@comment-73.68.216.182-20160803073558/@comment-88.106.227.123-20180205012910

I don't think Septimus himself time travelled, but there have been instances before in the Elder Scrolls of books appearing many years before their publication. Also, the wiki states that his name is derived from a latin phrase meaning "The Seventh Sign", so I don't think he's related to Tiber Septim, rather I think it's some sort of reference made by the devs that I don't understand.