Dacica ("Dacian [matters]"), or De bello dacico ("On the Dacian War"), is a lost Latin work by Roman Emperor Trajan, written in the spirit of Julius Caesar's commentaries like De Bello Gallico, and describing Trajan's campaigns in Dacia.
Based on the research so far, Dacica is considered lost. However, one sentence survived in the Latin grammar work by Priscian. To describe a grammatical rule, Priscian cites Trajan: inde Berzobim, deinde Aizi processimus, meaning We then advanced to Berzobim, next to Aizi. The phrase describes the initial penetration into Dacia by the Roman army. It also mentions two Dacian towns where later Roman castra were built: Berzovia and Aizis.
