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.
Milan I of Serbia Milan Obrenović (; 22 August 1854 – 11 February 1901), was the ruler of Serbia from 1868 to 1889, first as prince (1868-1882), subsequently as king (1882-1889).