Human settlements existed in the area of…

Human settlements existed in the area of Šabac, on the Sava River in western Serbia, in Neolithic times.

In the Middle Ages, a Slavic settlement named Zaslon existed at the current location of Šabac.

This settlement, first mentioned in Ragusan documents from 1454, had been part of the Serbian Despotate until it fell to the Ottoman Empire in 1459.

The Ottomans had built the town’s first fortress in 1470 and named it Bejerdelen (Böğürdelen, meaning "side-striker").

Sultan Mehmed II has proposed peace but Matthias, displeased at the peace between the Venetians and the Ottoman Turks, has refused him.

Instead, he storms into Ottoman territory and captures Šabac on February 15, 1476.

During the siege, Matthias barely escapes capture while he is watching the fortress from a boat on the Sava.

The fort will remain under the administration of the Kingdom of Hungary until 1521, when it will again be captured by the Ottoman Empire.