OLYBRIUS, Roman emperor of the West from the 11th of July to the 23rd of October 472, was a member of a noble family and a native of Rome.
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.
Proclaimed as emperor Olybrius, whom Leo had sent to pacify the two enemies, and after three months' siege took the city, on the 1st of July 472.
After the death of Olybrius the throne of the West remained vacant for some months, during which Italy was abandoned to barbarians.
Being connected by marriage with Leo I., emperor of the East, he was selected by him to succeed Olybrius on the Western throne, and proclaimed at Ravenna.