Board Thread:Lore Discussion/@comment-13417807-20130726023954/@comment-13199219-20130817140913

Actually, some works (Written by Michael Kirkbride, so it's sketchy) propose that the fabled 'Shattering of Aldmeris', the home continent of the elves, was actually the splitting up of the different groups of elves. It goes on to propose that everyone started on Tamriel, and the early Ehlofeny (I know I'm not spelling it right) merely traveled elsewhere (Like Atmora, Yokuda, Pyandonea, and Akavir).

So, essentially, Aldmeris was actually just a time when all the elves lived as one.