In 472 Olybrius was sent to Italy by the emperor Leo to assist the emperor Anthemius against his son-in-law Ricimer, but, having entered into negotiations with the latter, was himself proclaimed emperor against his will, and on the murder of his rival ascended the throne unopposed.
487), the last of the independent Roman administrators of Gaul, was the son of Aegidius, who had seized Gaul while Ricimer was master of Italy.
In 456 he defeated the Vandals in a sea-fight near Corsica, and on land near Agrigentum in Sicily, and backed by the popularity thus acquired, Ricimer then gained the consent of the Roman senate to an expedition against the emperor Avitus, whom he defeated in a bloody battle at Piacenza on the 16th of October 456.
Ricimer then obtained from Leo I., emperor at Constantinople, the title patrician, but in 457 set up Majorianus as his own emperor in the West, and induced Leo to give his consent.
When, however, Majorianus tried to rule by himself, Ricimer forced him to abdicate and caused his assassination on the 7th of August 461.
The successor whom Ricimer placed upon the throne was Libius Severus, who proved to be more docile than Majorianus, but had to face the rivalry of Leo in the East and Aegidius in Gaul.
Upon his death in 465 - said to be due to the poison of Ricimer - this emperor-maker ruled the West for eighteen months without an emperor, and then accepted Leo's candidate Anthemius, diplomatically married his daughter, and for some time lived in peace with him.
Before long, however, Ricimer moved to Milan, ready to declare war upon Anthemius.
St Epiphanius, bishop of Milan, patched up a truce, but in 472 Ricimer was again before Rome with an army of Germans,.
Of the officials; and Ricimer, jealous of his fame and influence, stirred up the foreign troops against him.