Augustus's reforms transformed Rome's Republican system of government to a "de facto" monarchy, couched in traditional Roman practices and Republican values. The "princeps" (later known as Emperor) was expected to balance the interests of the Roman military, Senate and people, and to maintain peace, security and prosperity throughout an ethnically diverse empire. The official offer of "cultus" to a living emperor acknowledged his office and rule as divinely approved and constitutional: his Principate should therefore demonstrate pious respect for traditional Republican deities and mores.