Who was the "king's engineer" to the  King of Portugal, Naples, Sicily and Sardinia and Duke of Milan?
Tibúrcio Spannocchi Tiburzio Spannocchi (1541–1609) (also Spanucchi, Spanochi, Spanoqui, Hispanochi etc.) was "king's engineer" to Philip II of Spain and subsequently to Philip III of Spain. He was named "Chief Engineer" in 1601.
Alfonso V of Aragon Alfonso the Magnanimous KG (also Alphonso; Catalan: Alfons ; 1396 – 27 June 1458) was the King of Aragon (as Alfonso V), Valencia (as Alfonso III), Majorca, Sardinia and Corsica (as Alfonso II), Sicily (as Alfonso I) and Count of Barcelona (as Alfonso IV) from 1416, and King of Naples (as Alfonso I) from 1442 until his death. He was one of the most prominent figures of the early Renaissance and a knight of the Order of the Dragon.