In 1658, as war with France began to wind down, a union between the royal families of Spain and France was proposed as a means to secure peace. Maria Theresa and the French king were double first cousins: Louis XIV's father was Louis XIII of France, who was the brother of Maria Theresa's mother, while her father was brother to Anne of Austria, Louis XIV's mother. Spanish procrastination led to a scheme in which France's prime minister, Cardinal Mazarin, pretended to seek a marriage for his master with Margaret Yolande of Savoy. When Philip IV of Spain heard of a meeting at Lyon between the Houses of France and Savoy in November 1658, he reputedly exclaimed of the Franco-Savoyard union that "it cannot be, and will not be". Philip then sent a special envoy to the French court to open negotiations for peace and a royal marriage.