A historical one. "White" Huns are also known as Hephthalites, and bugged the Sassanid northern frontier for quite a while. How much connection they had to the "Black" Huns that went westwards to Europe is a matter of some debate not helped one bit by the usual dearth of written accounts - like virtually all nomads they weren't too keen on writing stuff down, and I understand decent sources on even the Sassanids themselves are scarce indeed.
Bookmarks