To monitor the performance and curtail abuses of the prévôts or their equivalent (in Normandy a "vicomte", in parts of northern France a "châtelain", in the south a "viguier" or a "bayle"), Philip II Augustus, an able and ingenious administrator who founded many of the central institutions on which the French monarchy's system of power would be based, established itinerant justices known as "baillis" ("bailiff") based on medieval fiscal and tax divisions which had been used by earlier sovereign princes (such as the Duke of Normandy). The "bailli" was thus the king's administrative representative in northern France responsible for the application of justice and control of the administration and local finances in his "baillage" (in the south of France, the equivalent post was is "sénéchal, sénéchaussé").