The Peace of Westphalia was a series of peace treaties signed between May and October 1648 in Osnabrück and Münster .
The Peace of Westphalia refers to the pair of treaties , the Treaty of Osnabrück and the Treaty of Münster , signed on May 15 and October 24 of 1648 , which ended both the Thirty Years ' War and the Eighty Years ' War .