When the Empire occurred before fascism was invented.
I don't much care for the colloquialisms that change the defintions of fascism and communism to "something undesirable."
Fascism has always existed where imperialistic desires are harbored; the great game, the struggle of ideas, the virtue of strength and the spirit of the great leader.
Does not Talos command; Be strong for war. Be bold against enemies and evil, and defend the people of Tamriel?
It's just that in this modern age nothing exists unless it is defined, and so we define. I don't care, much, for colloquialisms either, but it dosen't mean stuff didn't exist beforehand.