Gemini on Question 22, Sep 18

Here are the first two paragraphs of the Wikipedia article on the Treaty of Westphalia (which is officially titled Peace of Westphalia on the site), based on its recent stable version:

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 of the House of Habsburg, France, the Swedish Empire, and their respective allies among the princes of the Holy Roman Empire, participated in these 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 were present at the same time. Two treaties were signed to end the Thirty Years' War: the Treaty of Münster (between the Holy Roman Empire and France, along with their respective allies) and the Treaty of Osnabrück (between the Holy Roman Empire and Sweden, along with their respective allies).

(Note: Because Wikipedia is a collaboratively and continuously edited platform, the exact wording may vary slightly depending on the exact day you view the live article.)