S1, E5: Julius Caesar, a scheming politician, used military power to dominate Rome. Massively in debt, he led his armies through a decade of conquest in a bid for wealth, glory and power. In the process he conquered Gaul and precipitated the downfall of the Celts. At the Battle of Alesia he brilliantly used technological superiority and tactical cunning against a force that outnumbered him by more than 5 to 1.