صلح وستفاليا
Innocent X objected to the conclusion of the Peace of Westphalia, which his nuncio, Fabio Chigi, protested in vain. In 1650 Innocent X issued the brief "Zelo Domus Dei" against the Peace of Westphalia, and backdated it to 1648 in order to preserve potential claims for confiscated land and property. The protests were ignored by the European powers.