上游充通大兽 SHANGHAI JIAO TONG UNIVERSITY Plato analyzes the polis in The Republic,whose Greek title,noNITsia (Politeia),itself derives from the word polis.The best form of government of the polis for Plato is the one that leads to the common good.The philosopher king is the best ruler because,as a philosopher,he is acquainted with the Form of the Good.Plato analyzes the polis in The Republic, whose Greek title, Πολιτεία (Politeia), itself derives from the word polis. The best form of government of the polis for Plato is the one that leads to the common good. The philosopher king is the best ruler because, as a philosopher, he is acquainted with the Form of the Good