Autokrator in the context of "Imperator"

Augustus (plural Augusti; /ɔːˈɡʌstəs/ aw-GUST-əs, Classical Latin: [au̯ˈɡʊstʊs]; "majestic", "great" or "venerable") was the main title of the Roman emperors during Antiquity. It was given as both name and title to Gaius Julius Caesar Octavianus (often referred to simply as Augustus) in 27 BC, marking his accession as Rome's first emperor. On his death, it became an official title of his successor, and was so used by all emperors thereafter. The feminine form Augusta was used for Roman empresses and other female members of the imperial family. The masculine and feminine forms originated in the time of the Roman Republic, in connection with things considered divine or sacred in traditional Roman religion. Their use as titles for major and minor Roman deities of the Empire associated the imperial system and family with traditional Roman virtues and the divine will and may be considered a feature of the Roman imperial cult.

In Rome's Greek-speaking provinces, "Augustus" was translated as Sebastos (Σεβαστός), or Hellenised as Augoustos (Αὔγουστος); these titles continued to be used in the Byzantine Empire until the Fall of Constantinople in 1453, although they gradually lost their imperial exclusivity in favour of Basileus and Autokrator.

Between 1345 and 1373, four Serbian monarchs held the title of emperor (tsar). The full title was initially Emperor of the Serbs and Greeks, later Emperor of the Serbs, Greeks and Bulgarians in Serbian and basileus and autokrator of Serbia and Romania ["the land of the Romans"] in Greek. This title was soon enlarged into "Emperor and Autocrat of the Serbs and Greeks, the Bulgarians and Albanians".The Serbian Empire was ruled by two monarchs: Stefan Dušan (r. 1346–1355) and Stefan Uroš V (r. 1355–1371). Two other claimants of the title ruled in Thessaly, Central Greece.

Sebastokrator (Medieval Greek: Σεβαστοκράτωρ, romanized: Sevastokrátor, lit. 'August Ruler', Byzantine Greek pronunciation: [sevastoˈkrator]; Bulgarian: севастократор, romanized: sevastokrator; Serbo-Croatian: sevastokrator), was a senior court title in the late Byzantine Empire. It was also used by other rulers whose states bordered the Empire or were within its sphere of influence (Bulgarian Empire, Serbian Empire). The word is a compound of sebastós (lit. 'venerable', the Greek equivalent of the Latin Augustus) and krátōr ('ruler', the same element as is found in autokrator, 'emperor'). The wife of a Sebastokrator was named sebastokratorissa (σεβαστοκρατόρισσα, sevastokratórissa) in Greek, sevastokratitsa (севастократица) in Bulgarian and sevastokratorica in Serbian.

Roman Mstislavich (c. 4 April 1152 – 19 June 1205), also known as Roman the Great, was Prince of Novgorod (1168–1170), Volhynia (1170–1189; 1189–1205), and Galicia (1189; 1198/99–1205). He founded the Romanovichi branch of Rurikids, which would rule Galicia–Volhynia until 1340.

By seizing the throne of Galicia, he dominated the western regions of Kievan Rus'. In the early 13th century, Byzantine chroniclers applied the imperial title of autocrate (αύτοκράτωρ) to him, but there is no evidence that he assumed it officially.

Anna of Savoy, born Giovanna (1306–1365), was a Byzantine Empress consort, as the second spouse of Andronikos III Palaiologos. She served as regent, with the titles augusta and autokratorissa, during the minority of her son John V Palaiologos from 1341 until 1347. In Byzantium, she was known as Anna Palaiologina, owing to her marriage to Andronikos.