On the Government of Rulers de Regimine Principum: Ptolemy of Lucca with Portions Attributed to Thomas AquinasPtolemy, considered a proto Humanist by some, combined the principles of Northern Italian republicanism with Aristotelian theory in his De Regimine Principum, a book that influenced much of the political thought of the later Middle Ages, the Renaissance, and the early modern period. He was the first to attack kingship as despotism and to draw parallels between ancient Greek models of mixed constitution and the Roman Republic, biblical rule, the