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

Valentinian I (Latin: Valentinianus; 321 – 17 November 375), sometimes known as Valentinian the Great, was Roman emperor from 364 to 375. He ruled the Western half of the empire, while his brother Valens ruled the East. During his reign, he fought successfully against the Alamanni, Quadi, and Sarmatians, strengthening the border fortifications and conducting campaigns across the Rhine and Danube. Also, his general Theodosius the Elder defeated a revolt in Africa and the Great Conspiracy (a coordinated assault on Roman Britain by Picts, Scoti, and Saxons). Valentinian founded the Valentinian dynasty, with his sons Gratian and Valentinian II succeeding him in the western half of the empire and his daughter Galla marrying emperor Theodosius I.

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.

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.