Question: The fictional deity Sigmar Heldenhammer is the patron deity of this faction whose cultures are based on what real-world empire?
Sentence (from "Sigmar"): The young chieftain of the Unberogens who lived 2,500 years before the present day of the Warhammer universe, he united the barbarian human tribes into what would become the mightiest human nation – the Empire.
Relevant evidence: No