ワルシャワ条約
Frederick's position continued to deteriorate; on 8 January, Austria, Britain, the Dutch Republic and Saxony signed the Treaty of Warsaw, which was clearly aimed at Prussia. This was accompanied by ominous signs of Russian military activity in Livonia, followed by the death of Emperor Charles VII on 20 January. Since Maria Theresa's husband, Duke Francis, was the best-supported candidate to replace him, this was a major setback for the Franco-Prussian alliance.