Prince of the Holy Roman Empire

Heraldic crown of a prince of the Holy Roman Empire
Mantle and princely hat
Princely hat (Fürstenhut [de])

Prince of the Holy Roman Empire (Latin: princeps imperii, ‹See Tfd›German: Reichsfürst, cf. Fürst) was a title attributed to a hereditary ruler, nobleman or prelate recognised by the Holy Roman Emperor.