<P> After the death of Olybrius there was a further interregnum until March 473, when Gundobad proclaimed Glycerius emperor . He may have made some attempt to intervene in Gaul; if so, it was unsuccessful . </P> <P> In 474 Julius Nepos, nephew and successor of the general Marcellinus, arrived in Rome with soldiers and authority from the eastern emperor Leo I. Gundobad had already left to contest the Burgundian throne in Gaul and Glycerius gave up without a fight, retiring to become bishop of Salona in Dalmatia . </P> <P> In 475, Orestes, a former secretary of Attila, drove Julius Nepos out of Ravenna and proclaimed his own son Flavius Momyllus Romulus Augustus (Romulus Augustulus) to be Emperor, on October 31 . His surname' Augustus' was given the diminutive form' Augustulus' by rivals because he was still a minor, and he was never recognized outside of Italy as a legitimate ruler . </P> <P> In 476, Orestes refused to grant Odoacer and the Heruli federated status, prompting an invasion . Orestes fled to the city of Pavia on August 23, 476, where the city's bishop gave him sanctuary . Orestes was soon forced to flee Pavia when Odoacer's army broke through the city walls and ravaged the city . Odoacer's army chased Orestes to Piacenza, where they captured and executed him on August 28, 476 . </P>

Who were the conquering forces of the western roman empire