28 BC is a year that falls at a pivotal moment in Mediterranean history. In Roman terms it was identified by the two consuls who held office that year, and it sits immediately before the reforms that would be ratified in 27 BC and mark the beginning of the Roman Empire. Surviving records about events in many regions are fragmentary, so historians reconstruct the year's significance by combining political, administrative and chronological evidence.
Roman politics and the consulship
The most prominent fact preserved about 28 BC is that Gaius Julius Caesar Octavian and Marcus Vipsanius Agrippa served as consuls. Consular dating was the standard way Romans named years, so official documents and inscriptions refer to the "Year of the First Consulship of Octavian and Agrippa." Octavian was then consolidating power after the civil wars; Agrippa was his close lieutenant and an accomplished general and administrator whose partnership with Octavian shaped Rome's transition from republican institutions toward a centralized imperial governance.
Calendar and dating issues
Sources disagree about how 28 BC maps to the Julian calendar: some reckon it a common year beginning on Saturday (Saturday start), Sunday (Sunday start) or Monday (Monday start), while others list it as a leap year beginning on Saturday (leap year, Saturday) or Sunday (leap year, Sunday). This ambiguity arises from early errors in applying leap-year rules to the newly introduced Julian calendar, which led to irregular counts until the system was corrected in the reign of Augustus.
- Consuls: Octavian and Agrippa (principal magistrates for the year).
- Chronology: Named by consular year rather than by regnal or Anno Domini systems.
- Calendar note: Early Julian leap-year misapplications create modern uncertainties about weekday starts.
Beyond Rome, contemporary polities such as the Western Han dynasty in China and various eastern kingdoms followed their own chronologies. In China the Han imperial line continued under emperors whose reigns overlap our year counts, while client kings and local dynasts in the Near East adjusted to Rome's rising influence. Surviving material for many regions is sparse, so broad statements about 28 BC must be generalized.
Historically, 28 BC is best seen as part of the immediate lead-up to the constitutional settlement of 27 BC when Octavian's position was formally regularized. The year is therefore useful to students of Roman political transformation and to historians tracing how ancient calendrical practices affect modern dating of old events.