Excerpts from Books and Wikipedia
"Representatives of Spain, France, Sweden, and the Holy Roman Empire were present as well as many German princes, the United Provinces (e.g. the Netherlands), and Swiss confederacy. It was the first such Europe-wide diplomatic conference, and the first attempt to produce a comprehensive settlement to long-running disputes." [1001 Days] "The Peace of Westphalia (German: Westfälischer Friede) was a series of peace treaties signed between May and October 1648 in the Westphalian cities of Osnabrück and Münster, largely ending the European wars of religion. The treaties of Westphalia brought to an end, a calamitous period of European history which caused the deaths of approximately eight million people." [Wikipedia]