Barbarian Gate: Adrianople—378, Pliska—811

S1 E5: Although waged 400 years apart, the battles of Adrianople and Pliska share a number of curious similarities. Explore how both defeats were triggered by the Romans' mistreatment of immigrant "barbarian" groups from the north - who might otherwise have been converted into allies - and overconfidence on the part of the Roman emperors.