Ovida, Obida or Odiva, was the last Roman ruler of Dalmatia, and a general, of the western provinces, during which late period?
Western Roman Empire 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.
Hellenistic armies The Hellenistic armies is the term applied to the armies of the successor kingdoms of the Hellenistic period, which emerged after the death of Alexander the Great. After his death, Alexander's huge empire was torn between his successors, the Diadochi (Greek: Διάδοχοι ). During the Wars of the Diadochi, the Macedonian army, as developed by Alexander and Philip II, gradually adopted new units and tactics, further developing Macedonian warfare and improving on the tactics used in the Classical era. The armies of the Diadochi bear few differences from that of Alexander, but during the era of the Epigonoi (Ἐπίγονοι, "Successors"), the differences were obvious, favoring numbers over quality and weight over maneuverability. The limited availability of Greek conscripts in the east led to an increasing dependence on mercenary forces, whereas in the west, Hellenistic armies were continuously involved in wars, which soon exhausted local manpower, paving the way for Roman supremacy. The major Hellenistic states were the Seleucid Empire, Ptolemaic Egypt and the Antigonid kingdom (Macedonia). Smaller states included: Attalid Pergamum, Pontus, Epirus, the Achaean League, the Aetolian League, Syracuse, and other states (like Athens, Sparta etc.).