Explanation: The source material indicates Jovinus was a senator from Gaul (Gallo-Roman) and claimed the imperial title within the Western Roman Empire, not the Eastern Roman Empire.

Explanation: Jovinus was proclaimed emperor in Mainz in 411 AD, not Ravenna.

Explanation: The barbarian kings who supported Jovinus were Gundahar of the Burgundians and Goar of the Alans, not the Franks and Vandals.

Explanation: Jovinus maintained his position as emperor in Gaul for a duration of two years, from 411 AD to 413 AD.

Explanation: Historical accounts indicate Jovinus was born in Gaul, not Rome.

Explanation: The hatnote functions to disambiguate this article, identifying Jovinus specifically as the Roman usurper and differentiating him from other historical figures bearing the same name.

Explanation: Jovinus's claim to emperorship was not recognized by the Senate in Rome; he is historically classified as a usurper.

Explanation: Jovinus was a Gallo-Roman senator who asserted a claim to the imperial title within the Western Roman Empire, adopting the full title 'Imperator Caesar Jovinus Augustus'.

Explanation: Jovinus was proclaimed emperor in the city of Mainz in the year 411 AD.

Explanation: Gundahar, king of the Burgundians, and Goar, king of the Alans, were the principal barbarian leaders who supported and proclaimed Jovinus as emperor.

Explanation: Jovinus maintained his claim to the emperorship for approximately two years, from 411 AD to 413 AD.

Explanation: The term 'usurper' signifies that Jovinus claimed the imperial title without legitimate hereditary right or official recognition from the established imperial authority.

Explanation: Jovinus's support base in Gaul included not only barbarian leaders such as Gundahar and Goar but also a number of local Gallo-Roman nobles.

Explanation: Gundahar and the Burgundians established their kingdom on the left bank of the Rhine River under Jovinus's nominal rule.

Explanation: The capital city of the Burgundian kingdom established during Jovinus's reign was Borbetomagus, identified today as Worms.

Explanation: The Visigoth leader Ataulf initially intended to join Jovinus after departing from Italy, indicating an early alignment.

Explanation: Galla Placidia was the half-sister of the Western Roman Emperor Honorius, not Jovinus.

Explanation: Jovinus was offended, not pleased, when Ataulf killed Sarus, as Sarus had intended to support Jovinus's claim to the emperorship.

Explanation: The Visigoths' possession of high-profile hostages like Priscus Attalus and Galla Placidia demonstrated their significant political leverage and power, not weakness.

Explanation: The Burgundian settlement under Gundahar was strategically located on the left bank of the Rhine River, which was considered the Roman side.

Explanation: In addition to barbarian leaders, Jovinus garnered support from influential local Gallo-Roman nobles within Gaul.

Explanation: Under Jovinus's nominal authority, Gundahar and the Burgundians established their settlement on the left bank of the Rhine River, in the region between the Lauter and Nahe rivers.

Explanation: The capital city of the Burgundian kingdom established during Jovinus's reign was Borbetomagus, modern-day Worms.

Explanation: Ataulf and the Visigoths were transporting significant hostages, including the former emperor Priscus Attalus and Galla Placidia, Honorius's half-sister.

Explanation: Jovinus was offended because Ataulf killed Sarus, a figure who had arrived in Gaul with the intention of supporting Jovinus's imperial claim.

Explanation: The Visigoths under Ataulf initially provided support to Jovinus but subsequently shifted their allegiance and allied with Emperor Honorius against him.

Explanation: The Burgundian settlement near the Rhine was strategically significant as it established a base on the left bank of the river, within territory previously considered Roman.

Explanation: Jovinus received support from local Gallo-Roman nobles, particularly after the defeat of Constantine III, indicating a complex political landscape beyond solely barbarian backing.

Explanation: Tangible evidence of Jovinus's asserted imperial authority primarily comes from the coinage he issued, which depicted him wearing the imperial diadem.

Explanation: Jovinus did not consult Ataulf before elevating his brother Sebastianus to the position of co-emperor; this unilateral action significantly damaged their relationship.

Explanation: Sebastianus, Jovinus's co-emperor, was captured and subsequently executed after their forces were defeated.

Explanation: Jovinus adopted the complete imperial titulature, styling himself 'Imperator Caesar Jovinus Augustus'.

Explanation: A siliqua, a type of Roman silver coin issued by Jovinus, is noted for celebrating his military achievements.

Explanation: The issuance of coinage bearing Jovinus's image and the imperial diadem serves as tangible evidence of his assertion of imperial authority.

Explanation: Jovinus's unilateral appointment of his brother Sebastianus as co-emperor, without consulting Ataulf, constituted a significant insult that alienated the Visigoths.

Explanation: Jovinus's co-emperor was his brother, Sebastianus, who was captured and executed following the military defeat of their regime.

Explanation: Issuing coinage bearing the imperial diadem was a deliberate symbolic act intended to legitimize Jovinus's rule and project an image of imperial authority.

Explanation: Initially allied with Jovinus, Ataulf and the Visigoths ultimately switched their allegiance and allied with Emperor Honorius against Jovinus.

Explanation: Jovinus was captured in Valentia (modern Valence), not Narbonne, after his forces suffered defeat.

Explanation: Claudius Postumus Dardanus, who held the position of praetorian prefect, was indeed responsible for carrying out Jovinus's execution.

Explanation: Jovinus was executed in Narbonne, not Ravenna. Ravenna was the capital of the Western Roman Empire at the time.

Explanation: Following their execution, the heads of Jovinus and Sebastianus were indeed sent to Emperor Honorius in Ravenna and displayed there.

Explanation: Following Jovinus's defeat and execution, Emperor Honorius was reaffirmed as the legitimate ruler of the Western Roman Empire.

Explanation: Jovinus's defeat involved not only the Visigoths under Ataulf, who allied with Honorius, but also the forces loyal to Emperor Honorius.

Explanation: The public display of Jovinus's head in Carthage, alongside those of other usurpers, served as a potent deterrent against future acts of rebellion.

Explanation: Ataulf and the Visigoths allied with the legitimate Western Roman Emperor Honorius to defeat Jovinus.

Explanation: Jovinus was captured in the city of Valentia, known today as Valence.

Explanation: The execution of Jovinus was carried out by Claudius Postumus Dardanus, the praetorian prefect loyal to Honorius.

Explanation: Although captured in Valentia, Jovinus ultimately met his end and was executed in Narbonne.

Explanation: After execution, the heads of Jovinus and Sebastianus were sent to Ravenna for display and subsequently transported to Carthage for permanent public exhibition.

Explanation: Emperor Honorius was confirmed as the legitimate ruler of the Western Roman Empire after Jovinus's downfall and execution.

Explanation: The public display of Jovinus's head in Carthage functioned primarily as a stark warning and deterrent against future attempts at usurpation and rebellion within the empire.

Explanation: Constantine III was Jovinus's predecessor, not his successor, as a claimant to the Western Roman Empire. Jovinus rose to power after Constantine III's defeat.

Explanation: Jovinus seized power in the context of the political instability following the defeat of Constantine III, not Emperor Majorian.

Explanation: The 'No footnotes' notice signifies a lack of inline citations, indicating that the article's sources are unclear and require verification through added citations.

Explanation: Constantine III was the immediate predecessor of Jovinus as a claimant to the Western Roman Empire, whose defeat created the political opening for Jovinus.

Explanation: Jovinus's rise to power was facilitated by the political instability and power vacuum created after the defeat and death of Constantine III.