Who is the first cannibal person?

The act of cannibalism dates back to a time before the human race was properly human, most people then did not speak but instead made gluttorial noises. Given that there was no real Words involved, just a form of noise you could postulate that the first person to 'be' a cannibal was probably named (sounds like) "EwwUrt" - meaning "Surprise that 'glog' is dead, and mog is eating glog with a touch of, hum I wonder if glog is any good."
We do not know because cannibalism happened so far in the past.