First century BC: Creation and deployment in Macedonia
The Legio V was one of the original twenty-eight legions raised by Octavian. There are two fifth legions recorded: the V Gallica and the V Urbana. It is possible that these both were early names for the V Macedonica. The legion probably participated in the Battle of Actium (31 BC). It later moved to Macedonia, where it stayed from 30 BC to AD 6, gaining its cognomen, before moving to Oescus (Moesia).
First century: The Great Jewish Revolt
Position of Roman legions in 80. XV Apollinaris was in Oescus (mark 14).
The Fifth was probably still in the East when the Great Jewish Revolt in Iudaea Province began in 66. Nero gave the V Macedonica, the X Fretensis and the XV Apollinaris to Titus Flavius Vespasianus to counter the revolt. In 67, in Galilee, the city of Sepphoris surrendered peacefully to the Roman army, and later the V Macedonica conquered Mount Gerizim, the chief sanctuary of the Samaritans. In the Year of the Four Emperors, 68, the legion stayed inactive in Emmaus, where several tombstones of soldiers of the V Macedonica remain. After the proclamation of Vespasian as Emperor and the end of the war under his son Titus, the V Macedonica left Iudaea and returned to Oescus (71). In 96, the later emperor Hadrian served the legion as tribunus militum.
Second century: In Dacia, protecting Danube frontier
Map of the castra of the V Macedonica in Potaissa (169-271), modern Turda, Romania.
In 101, the legion moved to Dacia, to fight in Trajan's campaign against the local populations. After the war ended in 106, the legion remained in Troesmis (modern Iglita), near the delta of the Danube since 107.
When Emperor Lucius Verus started his campaign against the Parthians (161–166), the legion moved to the east, but was later returned in Dacia Porolissensis, with a basecamp in Potaissa.
The northern frontier was a hot border of the Empire; when emperor Marcus Aurelius had to fight against the Marcomanni, the Sarmatians, and the Quadi, the V Macedonica was involved in these fights.
In 185 or 187, the legion was awarded of the title Pia Constans ("Faithful and reliable") or Pia Fidelis ("Faithful and loyal"), after defeating a mercenary army in Dacia.
Later centuries: Honors and evolution
While staying in Potaissa for most of the 3rd century, V Macedonica fought several times, earning honors. Valerian gave the Fifth the name III Pia III Fidelis; his son, Gallienus gave the legion the title VII Pia VII Fidelis, with the 4th, 5th and 6th titles awarded probably when the legion was used as a mobile cavalry unit against usurpers Ingenuus and Regalianus (260, Moesia). A vexillatio fought against Victorinus (Gaul, 269–271).
The cavalry unit created by Gallienus was definitively detached by Diocletian, and become part of his comitatus. This unit was sent to Mesopotamia, where it successfully fought against the Sassanid Empire in 296, and then to Memphis, where it had to stay until its entering in the Byzantine army.
