|Centuries:||1st century BC – 1st century – 2nd century|
|Decades:||0s BC 0s 10s – 20s – 30s 40s 50s|
|Years:||25 26 27 – 28 – 29 30 31|
|28 by topic|
|State leaders – Sovereign states|
|Birth and death categories|
|Births – Deaths|
|Establishment and disestablishment categories|
|Establishments – Disestablishments|
|Ab urbe condita||781|
|Chinese calendar||丁亥年 (Fire Pig)
2724 or 2664
— to —
戊子年 (Earth Rat)
2725 or 2665
|Coptic calendar||−256 – −255|
|- Vikram Samvat||84–85|
|- Shaka Samvat||N/A|
|- Kali Yuga||3129–3130|
|Iranian calendar||594 BP – 593 BP|
|Islamic calendar||612 BH – 611 BH|
|Minguo calendar||1884 before ROC
|Seleucid era||339/340 AG|
|Thai solar calendar||570–571|
Year 28 (XXVIII) was a leap year starting on Thursday (link will display the full calendar) of the Julian calendar. At the time, it was known as the Year of the Consulship of Silanus and Nerva (or, less frequently, year 781 Ab urbe condita). The denomination 28 for this year has been used since the early medieval period, when the Anno Domini calendar era became the prevalent method in Europe for naming years.
- Roman legions in Germania are transported by fleet to fortress of Flevum on the Rhine to operate against the rebellious Frisians.
- The Frisians negotiate a treaty with the Roman Empire at the River Rhine, avoiding conquest.
- King Daru of Baekje succeeds to the throne of Baekje in the Korean peninsula.
- According to the Book of Luke, the ministries of John the Baptist and Jesus began in this year.
- Tacitus, The Annals 4.73