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|Gregorian calendar||AD 89
|Ab urbe condita||842|
|Chinese calendar||戊子年 (Earth Rat)
2785 or 2725
— to —
己丑年 (Earth Ox)
2786 or 2726
|Coptic calendar||−195 – −194|
|- Vikram Samvat||145–146|
|- Shaka Samvat||10–11|
|- Kali Yuga||3189–3190|
|Iranian calendar||533 BP – 532 BP|
|Islamic calendar||549 BH – 548 BH|
|Julian calendar||AD 89
|Minguo calendar||1823 before ROC
|Seleucid era||400/401 AG|
|Thai solar calendar||631–632|
AD 89 (LXXXIX) was a common 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 Fulvus and Atratinus (or, less frequently, year 842 Ab urbe condita). The denomination AD 89 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.
- Legio XIII Gemina is transferred to Dacia to help in the war against Decebalus.
- Aquincum (old Budapest, Óbuda) is founded.
- First year of Yongyuan era of the Chinese Han Dynasty.
- June – The Han Chinese army under Dou Xian (d. AD 92), allied with the southern Xiongnu, is victorious over the Northern Xiongnu in the Battle of Ikh Bayan.
- Change of Patriarch of Constantinople from Polycarpus to Plutarch.
- Publication in Syria or Phoenicia of the Gospel of Matthew by a converted Jewish scholar.
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