Who was the "king's engineer" to the  King of Portugal, Naples, Sicily and Sardinia and Duke of Milan?
Philip III of Spain Philip III (Spanish: "Felipe" ; 14 April 1578 – 31 March 1621) was King of Spain. He was also, as Philip II, King of Portugal, Naples, Sicily and Sardinia and Duke of Milan.
Karl Joseph von Firmian Karl Joseph von Firmian (Trento, 15 August 1716 - Milan, 20 July 1782) was an Austrian noble, who served as Plenipotentiary of Lombardy to the Austrio-Hungarian Empire. His proper name was Karl Gotthard von Firmian, and in Italy known as "Carlo Giuseppe di Firmian". He was the nephew of Leopold Anton von Firmian.