After Jovinus usurped in Gaul the throne of the western Roman Emperor Honorius in 411 , he named Sebastianus as Augustus ( co-emperor ) in 412 .
Sebastianus ( died 413 ) , a brother of Jovinus , was an aristocrat of southern Gaul .
After Jovinus usurped in Gaul the throne of the western Roman Emperor Honorius in 411 , Sebastianus named Sebastianus as Augustus ( co-emperor ) in 412 .
Sebastianus ( died 413 ) , a brother of Jovinus , was an aristocrat of southern Gaul .