Board Thread:Lore Discussion/@comment-26400653-20150608022111/@comment-26400653-20150608185753

Pelagius the Geek wrote: I think it'll be the crowning of the High King/Queen, as it isn't shown as changing in-game. Or maybe the death of the Emperor.

During the dark brotherhood quest you kill the emporer, and the crowning of a high king in skyrim would be big in skyrim, the rest of Tamriel wouldn't really care, but I don't know you may be right seeing as the Thalmor are involved with the whole high king buissness.