<Ul> <Li> Algeria </Li> <Li> Andorra </Li> <Li> Austria </Li> <Li> Belgium </Li> <Li> Bosnia and Herzegovina </Li> <Li> Croatia </Li> <Li> France </Li> <Li> Germany </Li> <Li> Gibraltar </Li> <Li> Guernsey </Li> <Li> Hungary </Li> <Li> Italy </Li> <Li> Jersey </Li> <Li> Liechtenstein </Li> <Li> Libya </Li> <Li> Luxembourg </Li> <Li> Malta </Li> <Li> Monaco </Li> <Li> Morocco </Li> <Li> Netherlands </Li> <Li> Portugal </Li> <Li> San Marino </Li> <Li> Serbia </Li> <Li> Slovakia </Li> <Li> Slovenia </Li> <Li> Spain </Li> <Li> Switzerland </Li> <Li> Tunisia </Li> <Li> United Kingdom </Li> <Li> Vatican City </Li> </Ul> <Li> Bosnia and Herzegovina </Li> <P> In historiography, the Western Roman Empire consists of the western provinces of the Roman Empire at any one time during which they were administered by a separate independent Imperial court, coequal with (or only nominally subordinate to) that administering the eastern half . Both "Western Roman Empire" and "Eastern Roman Empire" (or "Byzantine Empire") are modern terms describing de facto independent entities; however, at no point did the Romans consider the Empire split into two, but rather considered it a single state governed by two separate Imperial courts out of administrative expediency . The view that the Empire was impossible to govern by one emperor was established by Diocletian following the disastrous civil wars and disintegration of the Crisis of the 3rd century, and was instituted in Roman law by his introduction of the Tetrarchy in AD 285, a form of government which was legally to endure in one form or another for centuries . The Western Court was periodically abolished and recreated for the next two centuries until final abolition by Zeno in 480, by which time there was little effective central control left in the area legally administered by the Western Court . </P> <P> The Western Roman Empire existed intermittently in several periods between the 3rd and 5th centuries, after Diocletian's Tetrarchy and the reunifications associated with Constantine the Great and Julian the Apostate (331 / 2--363). Theodosius I divided the Empire upon his death (in 395) between his two sons . Finally, eighty - five years later, Zeno of the Eastern Empire recognized the reality of the Western Empire's reduced domain--Roman power ceased to exist even in the Italian Peninsula--after the deposition of Romulus Augustus and the subsequent death of Julius Nepos, and therefore proclaimed himself the sole emperor of the Roman Empire . </P>

When was rome divided into east and west