<Tr> <Td> </Td> <Td> Olybrius FLAVIVS ANICIVS OLYBRIVS AVGVSTVS </Td> <Td> c. 420 AD </Td> <Td> Son - in - law of Valentinian III; appointed emperor by Ricimer . Not recognized by the Eastern Empire . </Td> <Td> July 11, 472 AD--November 2, 472 AD </Td> <Td> 3 months and 22 days </Td> <Td> November 2, 472 AD (aged 41) Natural causes </Td> </Tr> <Tr> <Td> </Td> <Td> Glycerius FLAVIVS GLYCERIVS AVGVSTVS </Td> <Td>? </Td> <Td> Appointed emperor by Gundobad (Ricimer's successor). Not recognized by the Eastern Empire . </Td> <Td> March 473 AD--June 474 AD </Td> <Td> 1 year </Td> <Td> after 480 AD (aged?) Deposed by Julius Nepos, became Bishop of Salona, time and manner of death unknown </Td> </Tr> <Tr> <Td> </Td> <Td> Julius Nepos FLAVIVS IVLIVS NEPOS AVGVSTVS </Td> <Td> c. 430 AD </Td> <Td> Nephew - in - law of the eastern emperor Leo I (and nephew of Marcellinus) appointed emperor in opposition to Glycerius </Td> <Td> June 474 AD--August 28, 475 AD (in Italy);--spring 480 AD (in Gaul and Dalmatia) </Td> <Td> 1 year / 6 years </Td> <Td> 480 AD (aged 50) Deposed in Italy by Flavius Orestes, ruled in balance of Western Empire until assassination in 480 . Maintained as figurehead in Italy by Odoacer to his death in 480 . </Td> </Tr> <Tr> <Td> </Td> <Td> Romulus Augustulus ROMVLVS AVGVSTVS </Td> <Td> c. 460 AD </Td> <Td> Appointed by his father, Orestes . Not recognized by the Eastern Empire . </Td> <Td> October 31, 475 AD--September 4, 476 AD (in Italy) </Td> <Td> 10 months and 4 days </Td> <Td> Unknown . Regarded as emperor more from historical convention than accuracy, his rule never extended beyond portions of the Italian peninsula and was not recognized by Eastern Emperor Zeno . Deposed by Odoacer, who then ruled in the name of Julius Nepos until the latter's death in 480, which formally ended the separate western empire; most likely lived out his life on a private villa in obscurity . </Td> </Tr>

Who were the two roman emperors who reformed rome in the 3rd and 4th century