Explanation: The Roman Empire during the 3rd century AD went through what is now called the "Crisis of the Third Century" (very creative), wherein a series of foreign incursions, civil wars, plagues, and a general breakdown of society resulted in the near-bankruptcy of the central government, total chaos, and the near-dissolution of the Empire. Luckily, the brave Emperors in charge of our beloved IMPERIVM SINE FINE knew just what to do - reduce the silver content of the coinage and pass it off at the old agreed-upon prices!
... this was a major contributor to demonetizing the Roman economy entirely and wrecking already-struggling trade.
But at least the Legions got paid! At least until the money became worthless entirely, and they just started passing laws allowing the Legions to seize whatever they needed wherever they were in lieu of money.
This is... this is a good solution, r-right guys...?
The rationalis was the public official in charge of the imperial mint.