Venetian–Byzantine Trade Treaty Dispute

Timeline

1. 1082Constantinople · Byzantine EmpireTo reward the Venetian fleet for helping fight the Normans, Alexios I issued a chrysobull in 1082 granting Venetian merchants duty-free status and extensive trading privileges in the empire's major ports, greatly facilitating Venice's expansion in Mediterranean trade.
2. 1120Constantinople · Byzantine EmpireAfter acceding in 1118, John II, for fiscal reasons and to counterbalance the Italian maritime republics (Pisa and Genoa), refused to renew the 1082 trade privileges as Venice demanded. Venetian envoys' negotiations came to nothing, mutual trust broke down, and relations between the empire and the republic entered a phase of confrontation.