Dyrrachium was on the? Given the previous question, write a context that contains the answer. It can be 1 - 20 sentences. Context:
The further decline of Byzantine state-of-affairs paved the road to a third attack in 1185, when a large Norman army invaded Dyrrachium, owing to the betrayal of high Byzantine officials. Some time later, Dyrrachium—one of the most important naval bases of the Adriatic—fell again to Byzantine hands.