Augustus (title)

Lore & Background

Some thirty years before its first association with Caesar's heir, augustus was an obscure honorific with religious associations, used in connection with provincial Lares and signifying the elevation of what was already sacred. Octavian, grand-nephew and adopted son of Julius Caesar, was officially renamed Augustus by the Roman Senate on 16 January 27 BC, after rejecting 'Romulus' as too blatant. His full title became Imperator Caesar Divi Filius Augustus, and he bequeathed the title to his adopted heir Tiberius in his will.

Reader's Guide

The title Augustus was central to the Roman imperial system, conferring no specific legal powers but serving as a titular element of the imperial name. It was bestowed by the Senate and later by acclamation of the army. Under the Tetrarchy, power was shared between two Augusti and two Caesares. After the fall of the Western Roman Empire, Charlemagne incorporated 'serenissimus Augustus' into his style, and the title was used by Holy Roman Emperors. In the Byzantine Empire, the Greek forms Sebastos and Augoustos continued until 1453, though they gradually lost imperial exclusivity to Basileus and Autokrator. The title's religious ambiguity allowed its extension to deities, fostering the imperial cult.

Did You Know?

• The first woman to receive the honorific Augusta was Livia Drusilla, by the last will of her husband Augustus.
• The title Augustus was translated as Sebastos in Greek-speaking provinces, and later as Augoustos.
• Charlemagne used the title serenissimus Augustus as a prefix to his titles.
• The dies imperii was the anniversary of the emperor's accession to power, not specifically the date of investiture with the title Augustus.

From Obscure Honorific to Imperial Name

The word augustus had existed in Latin long before it became synonymous with supreme power. Roughly three decades before its association with Caesar's heir, it functioned as a quiet religious epithet, appearing in contexts as early as 58 BC attached to provincial household gods. In literary and prose usage, it conveyed the idea of elevating something already sacred. Some Roman writers linked it to the practice of augury, and the city of Rome itself was said to rest on the "august augury" of its legendary founder. When the Senate formally renamed Octavian on 16 January 27 BC, the choice was deliberate and politically calculated. The name "Romulus" had been floated and discarded because it would have cast him as a second founder of the city, an overtly monarchical claim. Instead, Augustus carried the flavor of traditional Republican piety while remaining unprecedented as a personal cognomen. His full designation, Imperator Caesar Divi Filius Augustus, wove together military command, dynastic lineage, and sacred favor. The Senate either bestowed the name or ratified Octavian's own careful selection, a distinction that itself reveals the careful choreography of his accession.

Sacred Ambiguity and the Imperial Cult

The religious resonance of the title made it far more than a political label. Augustus' own reforms extended the epithet to a wide range of minor local deities across the provinces, from the Lares Augusti of Italian communities to obscure North African figures like Marazgu Augustus. This practice is regarded as a foundational element of the imperial cult, which persisted until Christianity supplanted traditional Roman religion. The title's deliberate ambiguity—sacred yet not explicitly divine—created a space in which provincial subjects, beginning in Asia and Bithynia, could adopt the worship of Augustus' genius, his vital soul, effectively establishing a ruler-cult without the Senate ever having to declare him a god. The feminine counterpart, Augusta, served empresses and other women of the imperial household, tying the entire family to traditional Roman virtues and the divine will. In this way, the title functioned as a bridge between the old Republican religious vocabulary and the new reality of a hereditary, quasi-sacred rulership, embedding the imperial system within the familiar sacred landscape that Roman citizens had known for centuries.

Succession, Legitimacy, and the Tetrarchy

After Augustus bequeathed the title to Tiberius in his will, it became a fixed element of the imperial name, though it carried no specific legal powers of its own. Roman law never contained an explicit formula for how one became princeps, a gap that became painfully visible when the Julio-Claudian line collapsed in 69 AD. Vespasian addressed this by issuing the lex quae dicitur de imperio Vespasiani, itemizing the offices and powers he claimed to have inherited from Augustus, Tiberius, and Claudius, and adopting the full name Imperator Caesar Vespasianus Augustus to anchor the Flavian dynasty in Julio-Claudian legitimacy. For over a century the title remained unique to a single bearer, until Marcus Aurelius elevated Lucius Verus to Augustus in 161, creating the first instance of two simultaneous holders. The Tetrarchy under Diocletian formalized a dual structure of two Augusti and two Caesares, yet Diocletian retained legislative supremacy as the senior Augustus. Both he and Constantine later used the formula semper Augustus, signaling that by the late third and early fourth centuries the title had become a formalized, almost constitutional designation rather than a personal honorific.

Echoes in Byzantium and Medieval Europe

In Rome's Greek-speaking provinces, the Latin title was rendered as Sebastos or, in its Hellenized form, Augoustos. These Greek equivalents survived the collapse of the Western Empire and continued to be used in the Byzantine Empire right up to the Fall of Constantinople in 1453, though over the centuries they gradually ceded their exclusive imperial association to the titles Basileus and Autokrator. In the West, the title found a new life after Charlemagne styled himself serenissimus Augustus, establishing a precedent that was woven into the formal style of the Holy Roman Emperor. Within the lands of the Holy Roman Empire, Augustus also drifted into use as a personal name for men of aristocratic birth, and it persists to this day as a male given name. This long afterlife—from provincial Greek temples to Byzantine chanceries to medieval coronation formulas—testifies to how deeply the title had embedded itself in the cultural and political vocabulary of the Mediterranean world, outliving the specific Roman institution that first gave it meaning by well over a millennium.

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