カルロ・エマヌエーレ3世
Determined to maintain the hold of his descendants on the court of Naples, Charles undertook lengthy diplomatic negotiations with Maria Theresa, and in 1758 the two signed the Fourth Treaty of Versailles, by which Austria formally renounced the Italian Duchies. Charles Emmanuel III of Sardinia, however, continued to pressure on the possible gain of Plaisance and even threatened to occupy it.