June 17, 2013 9:34 PM EDT
OK, I'll post it here as well:
According to The Rise and Fall of the Blades:
Late in the First Era, an invasion from Akavir cut through Skyrim. Even though Nords don't "meet invasions with pitchers of mead", they were unable to stop the mighty Akaviri Dragonguard, and it took the united armies of Cyrodiil to stop their advance at the Battle of Pale Pass. The Nords were understandably impressed, and for the first time, the whole of Skyrim pledged allegiance to one man: Reman Cyrodiil, one of the first Dragonborn recorded in history and the founder of the Second Empire of Man.
Also, according by both Dunmer and Nord sources (specifically Five Songs of King Wulfharth):
The Nords tried to reconquer Morrowind around 1E 700, but were rebuffed by united Chimer and Dwemer forces, and the Tribunal would protect Morrowind from invasion for thousands of years to come. The failure of the Nord Tongues in Morrowind prompted Jurgen Windcaller to begin a seven-year meditation to understand the failure, leading to the discovery of the Way of the Voice.