Question: The Union of Delft was the signed by the prince of which part of France?
Sentence (from "Prince of Orange"): After William III of England died without children, a dispute arose between Johan Willem Friso and Frederick I of Prussia, which was settled in the Treaty of Partition (1732); consequently, Friso's son, William IV had to share use of the title "Prince of Orange" (which had accumulated prestige in the Netherlands and throughout the Protestant world) with Frederick William I of Prussia.
Relevant evidence: No