Sebastianus (magister militum)
Encyclopedia
Sebastianus was a general of the Western Roman Empire
Western Roman Empire
The Western Roman Empire was the western half of the Roman Empire after its division by Diocletian in 285; the other half of the Roman Empire was the Eastern Roman Empire, commonly referred to today as the Byzantine Empire....

, son-in-law of Bonifacius
Bonifacius
Comes Bonifacius was a Roman general and governor of the Diocese of Africa. Along with his rival, Flavius Aëtius, he is sometimes termed "the last of the Romans."...

.

A good soldier and advisor, and an orthodox catholic, Sebastianus was son-in-law of the powerful Bonifacius
Bonifacius
Comes Bonifacius was a Roman general and governor of the Diocese of Africa. Along with his rival, Flavius Aëtius, he is sometimes termed "the last of the Romans."...

, comes Africae in 420s, nominated magister militum praesentalis and patrician by the Empress Galla Placidia
Galla Placidia
Aelia Galla Placidia , daughter of the Roman Emperor Theodosius I, was the Regent for Emperor Valentinian III from 423 until his majority in 437, and a major force in Roman politics for most of her life...

 in 432. The elevation of Bonifacius disturbed another influential general of the empire, the magister militum praesentalis Flavius Aetius
Flavius Aëtius
Flavius Aëtius , dux et patricius, was a Roman general of the closing period of the Western Roman Empire. He was an able military commander and the most influential man in the Western Roman Empire for two decades . He managed policy in regard to the attacks of barbarian peoples pressing on the Empire...

, who had fought and won several campaigns in Gaul
Gaul
Gaul was a region of Western Europe during the Iron Age and Roman era, encompassing present day France, Luxembourg and Belgium, most of Switzerland, the western part of Northern Italy, as well as the parts of the Netherlands and Germany on the left bank of the Rhine. The Gauls were the speakers of...

; fearing that the promotion of Bonifacius to such an elevated rank (Aetius was not a patrician) would have brought his own dismissal, Aetius took the initiative and attacked Bonifacius, who won the Battle of Ravenna (432)
Battle of Ravenna (432)
The Battle of Ravenna also known as the Battle of Rimini was fought in 432 between the two strong men of the Western Roman Empire, general Flavius Aëtius and comes Bonifacius ....

 but died for the wounds received.

Sebastianus took the office previously kept by his father-in-law. In the meantime, Aetius fled first to his country estates, then to Rome
Rome
Rome is the capital of Italy and the country's largest and most populated city and comune, with over 2.7 million residents in . The city is located in the central-western portion of the Italian Peninsula, on the Tiber River within the Lazio region of Italy.Rome's history spans two and a half...

 and, through Dalmatia and Pannonia, reached the Huns
Huns
The Huns were a group of nomadic people who, appearing from east of the Volga River, migrated into Europe c. AD 370 and established the vast Hunnic Empire there. Since de Guignes linked them with the Xiongnu, who had been northern neighbours of China 300 years prior to the emergence of the Huns,...

, who were his friends (Aetius had spent some years, as a boy, at the Hunnic court as a hostage). When, in 433, Aetius entered Italy with a large Hunnic army, it was clear who was to win the encounter: Sebastianus was deposed and fled to Constantinople
Constantinople
Constantinople was the capital of the Roman, Eastern Roman, Byzantine, Latin, and Ottoman Empires. Throughout most of the Middle Ages, Constantinople was Europe's largest and wealthiest city.-Names:...

, seeking refuge at the Eastern court. Here he obtained the support of influential members of the court; he allowed his supporters to start remunerative pirate activities in Hellespont and Propontis.

In 444, as result of some plots, he was obliged to flee the Eastern court; he reached the Visigothic court of Theodoric I
Theodoric I
Theodoric I sometimes called Theodorid and in Spanish, Portuguese and Italian Teodorico, was the King of the Visigoths from 418 to 451. An illegitimate son of Alaric, Theodoric is famous for defeating Attila at the Battle of the Catalaunian Plains in 451, where he was mortally wounded.-Early...

 and, from there, he went to Barcelona
Barcelona
Barcelona is the second largest city in Spain after Madrid, and the capital of Catalonia, with a population of 1,621,537 within its administrative limits on a land area of...

. Being declared a public enemy by the Romans, he decided to pass from Spain to Africa, where he was welcomed by the Vandal king Geiseric, who, at the beginning, kept Sebastianus as advisor, but later put him to death (450).

A different timeline of the events puts his departure from Constantinople in 435, his arrival in Africa in 440 and his death before 445.
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