Question: The fictional deity Sigmar Heldenhammer is the patron deity of this faction whose cultures are based on what real-world empire?

Related documents: [0]  [DOC] In Games Workshop's "Warhammer Fantasy" fictional universe, The Empire is one of the human political factions and armies, and is featured in many games and novels. In terms of location, language, culture, and society, it is clearly based on the real-world medieval Holy Roman Empire. [END] 
[1]  [DOC] Sigmar Heldenhammer is a fictional deity in the "Warhammer Fantasy" setting. He is the patron deity of The Empire. Before he became a god, Sigmar was a man, albeit an exceptional, perhaps even superhuman one. 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. His sign is a twin-tailed comet or a war hammer. [END]  
Answer: Holy Roman Empire
Holy Roman Empire