How did Jules Mazarin help settle the northern peace treaties of 1660?

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Jules, Cardinal Mazarin Jules, Cardinal Mazarin, detail of a portrait by Philippe de Champaigne; in the Musée Condé, Chantilly, France.

Jules Mazarin played a pivotal role in stabilizing European conflicts toward the end of his career. Following the successful negotiation of the peace treaty with Spain in 1659, he acted as an arbitrator to settle the "northern peace".1

Specifically, he facilitated the conclusion of the Treaty of Oliva and the Treaty of Copenhagen, which were signed in May 1660. By mediating these agreements, Mazarin helped restore stability to the region, contributing to his broader goal of returning peace to Christendom.1