Question: Who was the "king's engineer" to the  King of Portugal, Naples, Sicily and Sardinia and Duke of Milan?
Sentence (from "René of Anjou"): René of Anjou (Occitan: "Rainièr d'Anjau" ; French: "René d'Anjou" ; 1409–1480), also known as René I of Naples (Italian: "Renato I di Napoli" ) and Good King René (Occitan: "Rai Rainièr lo Bòn" ; French: "Le bon roi René" ), was count of Piedmont, Duke of Bar (1430–80), Duke of Lorraine (1431–53), Duke of Anjou, Count of Provence (1434–80), King of Naples (1435–42; titular 1442–80), titular King of Jerusalem (1438–80) and Aragon including Sicily, Majorca and Corsica (1466–70).
Relevant evidence: No