Marktbreit am Main (German: [maʁktˈbʁaɪ̯t] ⓘ) is a town in the district of Kitzingen in the Regierungsbezirk Unterfranken in Bavaria, Germany.

The municipality borders on (from the north clockwise): Marktsteft, Obernbreit, Martinsheim, Oberickelsheim, Ochsenfurt, Frickenhausen am Main and Segnitz.

[3] It was built in Augustan times in enemy territory beyond the "Limes" frontier in preparation for an invasion of the rest of Germany.

The headquarters (praetorium), the residences of three centurions, store rooms (horrea), and kilns had already been finished before the settlement was abandoned.

There are no traces of violence, and precious objects appear to have been taken away, which suggests that the Marktbreit castrum was evacuated when strategic realities had changed and made it unnecessary.

However, a rebellion in Pannonia delayed the execution of the invasion plan, and the defeat of Varus in the Teutoburg Forest put an end to all Roman ambitions east of the Rhine, and the base was never used.