At the beginning of the fourteenth century a dynasty change occurred in the Kingdom of Hungary.
and the town prospered during the rule of king Charles Robert I, who  started building the modern fortress in 1338–42.
The new town (fortress) on Mostonga had the quadrangular tower with six floors, important for the defense of the city.
Originally there were 8 towers, various chambers of the county manager, a chapel, guard towers, kitchen, water well, barn, and various other premises, the remains of which stand today.

The fort and the town developed as Bač was the major crossroad at the time.
Roads from and to Europe, the Balkans and the Mediterranean all crossed here, and the tall central tower allowed the overseeing and control of the lowlands and both the river and the land traffic.

Though the construction began in the first half of the 14th century, which is the base of what survived until today, the complex was shaped in the present way by the 15th century and reached its full extension by the 16th century.
Archbishop Péter Váradi expanded and embellished the fortress and also dredged the Mostonga so that ships from the Danube were able to reach the fort.

From the 15th century, it was the most important Hungarian defense point against the invading Ottoman forces.
The pivotal moment was the disastrous Hungarian defeat in 1526 at the Battle of Mohács, so the Ottomans conquered Bač in 1529.
During the war between Ottoman Empire and the Kingdom of Hungary, in the 16th century, Serbian despot Stevan Berislavić successfully defended the Bač fortress from the Ottomans for a long time until the fortress finally fell.
At the beginning of the fourteenth century a dynasty change occurred in the Kingdom of Hungary. and the town prospered during the rule of king Charles Robert I, who  started building the modern fortress in 1338–42. The new town (fortress) on Mostonga had the quadrangular tower with six floors, important for the defense of the city. Originally there were 8 towers, various chambers of the county manager, a chapel, guard towers, kitchen, water well, barn, and various other premises, the remains of which stand today.
The fort and the town developed as Bač was the major crossroad at the time. Roads from and to Europe, the Balkans and the Mediterranean all crossed here, and the tall central tower allowed the overseeing and control of the lowlands and both the river and the land traffic.
Though the construction began in the first half of the 14th century, which is the base of what survived until today, the complex was shaped in the present way by the 15th century and reached its full extension by the 16th century. Archbishop Péter Váradi expanded and embellished the fortress and also dredged the Mostonga so that ships from the Danube were able to reach the fort.
From the 15th century, it was the most important Hungarian defense point against the invading Ottoman forces. The pivotal moment was the disastrous Hungarian defeat in 1526 at the Battle of Mohács, so the Ottomans conquered Bač in 1529. During the war between Ottoman Empire and the Kingdom of Hungary, in the 16th century, Serbian despot Stevan Berislavić successfully defended the Bač fortress from the Ottomans for a long time until the fortress finally fell.
Bač Fortress