Board Thread:Lore Discussion/@comment-2165692-20140531154239/@comment-67.182.14.90-20150117205913

The original races of humans are the atmorans of atmora, the redguards of yokuda, the nedes of tamriel, and the akaviri of akavir. When the aldmer migrated to tamriel, they bred with the nedes and made bretons. When the atmorans landed in tamriel, they bred with the nedes and created the foundation for nords and imperials. Redguards aren't part of the family tree at all, same goes for the akaviri.

tl;dr, the nedes got around