The Treaty of Constantinople was signed on January 25, 1479, which officially ended the fifteen-year war between the Republic of Venice and the Ottoman Empire. The agreement was established as a result of the Ottomans having reached the outskirts of Venice. Based on the terms of the treaty, the Venetians were allowed to keep Ulcinj, Antivan, and Durrës. However, they ceded Shkodra (which had been under Ottoman siege for many months), as well as other territories on the Dalmatian coastline, as well as relinquished control of the Greek islands of Negroponte (Euboea) and Lemnos. Moreover, the Venetians were forced to pay 100,000 ducat indemnity and agreed to a tribute of around 10,000 ducats per year in order to acquire trading privileges in the Black Sea. As a result of this treaty, Venice acquired a weakened position in the Levant.
^Conflict and Conquest in the Islamic World: Alexander Mikaberidze, page 917, 2011
^The Encyclopedia of World History (2001) - VeniceThe great war against the Turks (See 1463–79). Negroponte was lost (1470). The Turks throughout maintained the upper hand and at times raided to the very outskirts of Venice. In the Treaty of Constantinople (1479), the Venetians gave up Scutari and other Albanian stations, as well as Negroponte and Lemnos. Thenceforth the Venetians paid an annual tribute for permission to trade in the Black Sea.