The Drobeta (castra) was a fort built by Emperor Trajan in the province of Roman Dacia, in the present city Drobeta-Turnu Severin.

The orientation of the fort is an exception to Roman military architecture as the Porta Praetoria gate is to the South, possibly because it defended the bridge.

[8] In the second stage, of Hadrian's era, stone buildings included the praetorium (officers' residence), barracks, hospital (valetudinarium) and horrea.

Due to the change in military tactics and defense, three gates were closed: the decumana and two principales, and a large outer tower with a square plan was built in their place.

[9] In the fourth phase repairs were made and the enclosure wall was modified following the withdrawal from Dacia during the time of Constantine the Great (306-337).