Firmus (died 375) was a Berber Numidian prince and Roman usurper under Valentinian I.
Firmus was the son of the Berber Jubaleni prince Nubel, a powerful Roman military officer, as well as a wealthy Christian. When Nubel died, Firmus killed his half-brother Zammac, who had illegitimately appropriated Nubel's wealth, and became successor to his father.
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Count Theodosius (Latin: Theodosius comes; died 376), Flavius Theodosius or Theodosius the Elder (Latin: Theodosius major), was a senior military officer serving Valentinian I (r. 364–375) and the Western Roman Empire during Late Antiquity. Under his command the Roman army defeated numerous threats, incursions, and usurpations. Theodosius was patriarch of the imperial Theodosian dynasty (r. 379–457) and father of the emperor Theodosius the Great (r. 379–395).
Appointed comes rei militaris per Britannias (commander of mobile military forces for the Diocese of the Britains) by Valentinian, Theodosius put down the Great Conspiracy (367–368) and the usurpation of Valentinus. After restoring order in Britain he returned to continental Europe and fought against the Alemanni; as Valentinian's magister equitum (Master of Horse) he successfully invaded Alemannic territory (371 or 370). In 372 Theodosius led a successful campaign against the Sarmatians. Within the same year Firmus, a Mauritanian prince, rebelled against Roman rule with the help of African tribes like the Abanni and Caprarienses. Theodosius was sent to Africa and in two hard-fought campaigns (373–374) put down the insurrection. In 376, after the death of emperor Valentinian, he was arrested and executed, presumably as he was seen as a threat to the new western emperors Gratian and Valentinian II.
The Abanni (also called Abannae) were an ancient tribe in the northwest of Africa.
They settled in the ancient region of Mauretania, which encompassed the north of the present-day states of Morocco and Algeria and was part of the Roman Empire in the first centuries anno Domini. Together with the adjacent tribe of the Caprarienses, whose members lived in the mountains named after them, the Abanni in circa 375 AD took part in the uprising of the usurper Firmus against the Roman Emperor Valentinian I. Both tribes were defeated by the Roman general Theodosius. After this success Theodosius is believed to have subsequently moved to Auzia.