A lot of people reference the men of Akavir as being 'eaten' by the vampiric snake-like people we call the Tsaeci. But reading on the Imperial Library has brought me new insight. Here is a quote from the page:


The part that catches my attention is "BUT STILL LOOK LIKE THEM". Leading me to wonder if the Tsaeci were a type of Akaviri man but eventually became the dominate type. In other words think of Vampires and the Tamrielic Men; it's as if saying the Vampires 'ate' the Men and instead of men there are just Vampires now.

References:
http://www.imperial-library.info/content/guide-akavir

I have my doubts that the Tsaesci were originally men - if you read We Ate It To Become It, the Tsaesci creation myth clearly includes a ton of reptilian imagery and metaphor which would be strange to come from a race of man. Plus, them being men is a bit less interesting to me than them being the Shape-Changing, Language-Eating Vampiric Snake People of Akavir.