Gemini on Question 22, Sep 29

Here are the first two paragraphs of the Wikipedia article on the Treaty of Westphalia (which is titled Peace of Westphalia on Wikipedia), reflecting its most stable and recent wording:

The Peace of Westphalia (German: Westfälischer Friede, pronounced [vɛstˈfɛːlɪʃɐ ˈfʁiːdə] ⓘ) is the collective name for two peace treaties signed in October 1648 in the Westphalian cities of Osnabrück and Münster. They ended the Thirty Years' War (1618–1648) and brought peace to the Holy Roman Empire, closing a calamitous period of European history that killed approximately eight million people. The Holy Roman Emperor (Ferdinand III), the Spanish monarchy, the kingdoms of France and Sweden, and their respective allies among the princes of the Holy Roman Empire participated in the treaties.

The negotiation process was lengthy and complex. Talks took place in two cities, because each side wanted to meet on territory under its own control. A total of 109 delegations arrived to represent the belligerent states, but not all delegations were present at the same time. Two treaties were signed to end the war in the Empire: the Treaty of Münster and the Treaty of Osnabrück. These treaties ended the Thirty Years' War in the Holy Roman Empire, with the Habsburgs (rulers of Austria and Spain) and their Catholic allies on one side, battling the Protestant powers (Sweden and certain Holy Roman principalities) allied with France (which was Catholic but anti-Habsburg).

(Note: Because Wikipedia is a collaboratively edited encyclopedia, minor phrasing variations or additions may occur over time, but this represents the core, established lead of the article).