Gemini on Question 22, Oct 3

Here are the first two paragraphs of the Wikipedia article on the Peace of Westphalia (the standard title for the treaty on Wikipedia), based on its most stable and recent version:

The Peace of Westphalia 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 Eighty Years' War (1568–1648) between Spain and the Dutch Republic was also concluded with the Peace of Münster, which is considered part of the broader Westphalian settlement.

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. The treaties were agreed upon by the Holy Roman Emperor Ferdinand III, the Spanish monarchy, the Kingdom of France, the Swedish Empire, the Dutch Republic, the Princes of the Holy Roman Empire, and sovereigns of the free imperial cities.

(Note: Because Wikipedia is a live, user-edited encyclopedia, the exact phrasing of its articles can change frequently. However, this reflects the standard, stable introduction to the article).