Question: What type of leaden does Gertrude of Brunswick and Henry V, Holy Roman Emperor have in common?
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