Taxes, soldiers, and loyalty: these were the foundations, the structures, of the Roman political system. This episode explores how and why they fell apart over the course of the disastrous fifth century, which saw the provinces gradually slip away from the control of the imperial center. Watch a preview of Genius, the new show on National Geographic about Albert Einstein, starring academy award winner Geoffrey Rush: NatGeoTV.com/Genius Take the survey at wondery.com/survey.