Board Thread:Lore Discussion/@comment-3225355-20150107041151/@comment-72.74.78.185-20150110194414

The Aldmeri dominion probably wins the three banners war because Talos is mentioned as fighting against them in his conquest of Tamriel. Maybe Elswyr just left after the three banners war and the organization changed it's name to the second Aldmeri dominion. But that wouldn't explain why they don't control any of Cyrodiil at the time of Talos's conquest.