Question: In what time period was the prequel to "Fate/stay night" named a best anime series?
Sentence (from "Fate/Zero"): The main protagonist, Kiritsugu Emiya, the foster father of "Fate/stay night"'s protagonist, Shirō Emiya, is known as a merciless mage killer who joins the tournament on behalf of his wife's family, the Einzberns.
Relevant evidence: No