- The first urban settlements in the Šabac area formed in the 10th century
- During the period of Hungarian rule, Šabac was known as Mačo (Macho) and was the center of the Banate of Mačva
- This territory fell under Serbian rule in the 13th century, during the reign of Serbian King Dragutin
- The city Zaslon is first referred to in the Dubrovik arhives in 1454 as an important trading and crafts center
- In 1470, the Turks who arrived in this territory after the fall of the Serbian Despotate fortified the city
