Question: Italian harpist, Abramo dall'Arpa, went to Vienna at the request of the Holy Roman Emperor, who served as what?
Sentence (from "Concordat of Worms"): It brought to an end the first phase of the power struggle between the Papacy and the Holy Roman Emperors and has been interpreted as containing within itself the germ of nation-based sovereignty that would one day be confirmed in the Treaty of Westphalia (1648).
Relevant evidence: No