The Ottomans capture Euboea.

The Ottoman Empire, also called the Turkish Empire, was an imperial realm that controlled much of Southeast Europe, West Asia, and North Africa from the 14th to early 20th centuries; it also controlled parts of southeastern Central Europe, between the early 16th and early 18th centuries.

The siege of Negroponte was fought between the forces of the Ottoman Empire, led by Sultan Mehmed II in person, and the garrison of the Venetian colony of Negroponte (Chalcis), the capital of the Venetian possession of Euboea in Central Greece. The Ottoman sultan Mehmed II laid siege to the fortress at Negroponte. The siege lasted for almost a month, and, despite great Ottoman casualties, ended in the capture of the city and the island of Euboea by the Ottomans.

July 12 is the 193rd day of the year in the Gregorian calendar; 172 days remain until the end of the year.