Who among the following thinkers gave the concept of “lions” and “foxes” ?

Drawing on Niccolò Machiavelli’s metaphor in The Prince, Italian elite theorist Vilfredo Pareto classified governing elites in The Mind and Society (1916) into ‘lions’ (rulers dominated by ‘Class II residues’ of persistence of aggregates who rely on force, tradition, and stability) and ‘foxes’ (rulers dominated by ‘Class I residues’ of combinations who rely on cunning, persuasion, and innovation).