greecogreeko 

Hi and i hope learn more from you in future ;)
About that, I think a Historical power must be a civilization or urbanish power at the first and it must be verified as a Historical of Power, not a legend or any wild tribes without an country.
I think a Historical Power at least must be a country that it was a winner in wars for a during or in Culture as Roman Empire, but Gukturk is just a legend against Soviet Union.
my name is Greeko