Overview
AD 28 was a year in the 1st century of the Common Era. In the Julian calendar it is recorded as a leap year that began on a Thursday. In Roman practice the year was commonly identified by the names of its two consuls — in this case "the Year of the Consulship of Silanus and Nerva" — rather than by a numerical era. The designation "AD 28" (Anno Domini) was applied retroactively centuries later when that system became standard in medieval Europe.
Calendar and dating conventions
The Julian calendar, instituted by Julius Caesar in 45 BC, inserted a leap day roughly every four years to align the calendar year with the solar year. When modern scholars describe AD 28 as a leap year starting on Thursday, they are projecting the Julian reckoning backward and forward to give a consistent frame for chronology. Ancient Romans themselves usually dated events by the names of annually elected consuls or by regnal years of emperors.
Political and historical context
AD 28 falls within the reign of the Roman emperor Tiberius (ruled AD 14–37). During this period, Rome continued to consolidate imperial administration and governance across its provinces. Many surviving ancient sources use consular dating or imperial regnal years, so modern historians translate those references into the AD system to build synchronized chronologies for the Mediterranean world and beyond.
Uses and significance
For historians and chronologists, a year like AD 28 serves as a reference point for arranging events and comparing records from different regions and cultures. Naming years by consuls illustrates Roman civic practice, while the later adoption of the Anno Domini era shows how chronological systems evolve. The simple statement that AD 28 was a leap year beginning on Thursday helps align calendars for archaeological and textual studies.
Notable distinctions and further reading
AD 28 should not be confused with 28 BC, which lies in the late Roman Republic era; chronological prefixes and systems matter. For more on calendar mechanics, Roman consular lists, and period chronologies consult the following resources: