The historical documentary series continues with a look at the two great wars led by the Roman Emperor Trajan against the people of Dacia.
No written documentation of this campaign survives, but its story is depicted in stone on Trajan's Column, a monument that has towered above Rome for almost 2,000 years.
Using this sculptured frieze as a starting point, the film retraces the steps of Trajan's army and the course of the wars, and uncovers the military secrets of an empire founded on war.