Valentinus (rebel) in the context of "Count Theodosius"

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.

Dulcitius may refer to either of two ancient Roman officials active in the fourth century AD.

• Dulcitius (Macedonia) was governor of Macedonia during the reign of the emperor Diocletian. He is chiefly remembered for his role in a hagiographic tale of the persecution of several Christian women in Thessalonica, in 304 AD. As such, he is the eponymous villain of Dulcitius, a 10th-century drama written by Hrotsvitha of Gandersheim.

• Dulcitius (Britannia) was a military leader praised for his abilities by the soldier-historian Ammianus Marcellinus. Although it is not actually stated by Ammianus in his original text, it is often conjectured that Dulcitius was elevated to the position of Dux Britanniarum. If this is the case, he is thought to have been brought to Britain in 369 AD by Count Theodosius in the aftermath of the Great Conspiracy, in which Roman rule on the island faced simultaneous challenge from internal rebellion and external invasion. He might have been appointed Dux as a replacement for Fullofaudes, who is likely to have been killed or lost somewhere in the north of Britain. The Roman rebel Valentinus and his associates were handed over to Dulcitius for execution.