The Third Century Crisis becomes manageable under Diocletian, but the emperor still faces many problems, and not all of them as exciting as assassination. The rampant devaluing of currency and lack of formal tax system makes it very difficult for the state to accumulate wealth. So Diolcletian will overhaul the tax system and that will become his most long-lasting achievement. But his more famous invention is the tetrarcy, Rome's imperial boy band who will work to stabilize the massive empire.