Minerva, or "Arma" (Allegory of the Art of War), pl. 2 in the Schema, seu Speculum Principum (Skills of a Prince) series — Jan Sadeler, the Elder, ca. 1550 – 1600; Jan van der Straet, called Stradanus, Flemish, 1523–1605Minerva, or "Arma" (Allegory of the Art of War), pl. 2 in the Schema, seu Speculum Principum (Skills of a Prince) series — Jan Sadeler, the Elder, ca. 1550 – 1600; Jan van der Straet, called Stradanus, Flemish, 1523–1605