1/2. Despite ruling a vast empire, the Romans didn't do everything at the point of a sword. Boris Johnson looks at how the Romans ran a united Europe, and ponders challenges facing the European Union. The journey takes him to Rome itself, the ancient harbour city of Ostia, Provence and the Rhineland. Are there lessons for modern Europeans to learn? Producers Francis Hanly and David Jeffcock : Executive producers Charles Brand and Lucy Hetherington Boris Johnson answers One Final Question: page