Gemini on Question 22, Sep 28

The Wikipedia article for this topic is titled Peace of Westphalia (as it refers to a pair of treaties rather than a single one). Because Wikipedia is continuously edited, minor wordings may change from day to day, but here are the first two paragraphs as they appear in their stable, standard form:

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 two treaties were the Peace of Münster between the Holy Roman Empire and France, and the Peace of Osnabrück between the Holy Roman Empire and Sweden. A related treaty, also known as the Peace of Münster, was signed in January 1648 between the Spanish Empire and the Dutch Republic. This ended the Eighty Years' War (1568–1648) and is sometimes considered part of the Peace of Westphalia. The negotiations involved 109 delegations representing European powers, including Holy Roman Emperor Ferdinand III, Philip IV of Spain, the Kingdom of France, the Swedish Empire, the Dutch Republic, and princes of the Holy Roman Empire.