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|155 by topic|
|Ab urbe condita||908|
|Balinese saka calendar||76–77|
|Chinese calendar||甲午年 (Wood Horse)|
2851 or 2791
— to —
乙未年 (Wood Goat)
2852 or 2792
|Coptic calendar||−129 – −128|
|- Vikram Samvat||211–212|
|- Shaka Samvat||76–77|
|- Kali Yuga||3255–3256|
|Iranian calendar||467 BP – 466 BP|
|Islamic calendar||481 BH – 480 BH|
|Minguo calendar||1757 before ROC|
|Seleucid era||466/467 AG|
|Thai solar calendar||697–698|
281 or −100 or −872
— to —
282 or −99 or −871
Year 155 (CLV) was a common year starting on Tuesday (link will display the full calendar) of the Julian calendar. At the time, it was known as the Year of the Consulship of Severus and Rufinus (or, less frequently, year 908 Ab urbe condita). The denomination 155 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.
- Emperor Antoninus Pius starts a new war against the Parthians who are led by Vologases IV. The war is brief and results in an inconclusive peace.
- Rome states that while it will not be recognized as an official religion, Judaism must be tolerated.
- To restore peace between the Jews and Romans, Antoninus relegalizes circumcision.
- The Romans begin to abandon Hadrian's Wall.
- First year of Yongshou era of the Chinese Han Dynasty.
- Pope Anicetus succeeds Pope Pius I as the eleventh pope.
- The Christian bishops are in disagreement regarding the date of Easter.
- Dio Cassius, Roman historian (d. ca. 235)
- Cao Cao, Han dynasty warlord (d. 220)
- Sun Jian, Han dynasty warlord (d. 191)