The Roman Empire's Continuation of the Danube Frontier

The province of dacia was a lead weight around rome's neck. It added over 500 miles to the military perimeter of the empire without offering any kind of strategic or tactical value in return. To give it up would have been an affront to the memories of those who had just fought and died to take it. And bottom line, hanging on to dacia put the empire in greater danger than it needed to be in.