Its first base was Burnum in the province of Dalmatia (modern Kistanje). The Fourth Flavian legion replaced XI Claudia, which had been transferred to the Rhine. The presence of IIII Flavia Felix is attested by a couple of inscriptions and several roof tiles and bricks. Among its soldiers was Javolenus Priscus, who became one of the most famous Roman jurists during the reign of the emperor of Trajan.
In these first years of the legion's existence, IIII Flavia received the title Felix. It is possible that it bore this title from the foundation, but it is more likely that it commemorated a victory, perhaps over the Dacians, which were to become dangerous enemies in the next forty or so years. They lived in modern Rumania, north of the Danube.
The Dacians invaded the Roman empire in 86 and defeated the legions that were supposed to defend Moesia. The emperor Domitian reorganized the frontier of the Danube and prepared the region for war against the Dacians. The province of Moesia was divided into two provinces, and IIII Flavia was to defend Moesia Superior - the western half of the Lower Danube frontier. It is likely that it was now stationed at Singidunum or Belgrade, although a brief stay at Viminacium (Kostolac in Serbia) can not be excluded. This was the base of VII Claudia, but several inscriptions suggest that (a subunit of) the Fourth used this base as well.
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In 88, a large Roman army group invaded Dacia and general Tettius defeated its king Decebalus at Tapae; the Fourth was one of nine legions involved. Unfortunately, the revolt of the governor of Germania Superior, Lucius Antonius Saturninus, in 89, prevented the ultimate success.
In 98, the emperor Trajan ordered the legion to build roads in the region north of the Danube, where Tibiscum (modern Jupa) was founded (and copper mines were explored). The Iron Gate was now protected on both sides by Roman troops. Four years later, IIII Flavia Felix took part in the Dacian campaign of Trajan and was briefly stationed in the capital of the newly annexed territories, Sarmizegetusa. (The other legions in the occupation force were I Adiutrix and XIII Gemina.) A subunit built a fort near Arad in western Rumania, where it controlled the Sarmatians, a tribe in eastern Hungary that had annihilated the XXI Rapax in 92, and guarded the road along the river Mures, which connected Dacia and Pannonia (western Hungary).
Trajan's successor Hadrian transferred the legion back to Belgrade and gave up part of the conquests, but Roman troops continued to patrol along the Mures road. A subunit garrisoned Apulum (Alba Julia), which was famous for its gold mines.
The legion is also known to have guarded several roads in Moesia Superior. A police post at Naissus (modern Niš on the Morava) is mentioned in an inscription. Another post was Ulpiana, where the road from the Danube forked: one branch led to Thessalonica and the Aegean Sea, the other to Scodra and the Adriatic Sea.
During the reign of Antoninus Pius (138-161), the Danube frontier was quiet and a subunit of the fourth legion could be sent to Mauretania to fight against the Moors.
Monuments of IIII Flavia Felix have been found at Aquincum (Budapest). This suggests that a subunit replaced II Adiutrix during its absence during the wars of Lucius Verus against the Parthian empire (162-166). |