In 1180, the two cities agreed to a nonaggression treaty in the Tyrrhenian and the Adriatic, but the death of Emperor Manuel Comnenus in Constantinople changed the situation.
I 1180 indgik de to byer i en ikke-aggresiv aftale i det Tyrrhenske Have og Adriaterhavet, men kejser Manuel Comnenuss død i Konstantinopel ændrede situtationen.