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|171 by topic|
|Ab urbe condita||924|
|Balinese saka calendar||92–93|
|Chinese calendar||庚戌年 (Metal Dog)|
2867 or 2807
— to —
辛亥年 (Metal Pig)
2868 or 2808
|Coptic calendar||−113 – −112|
|- Vikram Samvat||227–228|
|- Shaka Samvat||92–93|
|- Kali Yuga||3271–3272|
|Iranian calendar||451 BP – 450 BP|
|Islamic calendar||465 BH – 464 BH|
|Minguo calendar||1741 before ROC|
|Seleucid era||482/483 AG|
|Thai solar calendar||713–714|
297 or −84 or −856
— to —
298 or −83 or −855
Year 171 (CLXXI) was a common year starting on Monday (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 Herennianus (or, less frequently, year 924 Ab urbe condita). The denomination 171 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 Marcus Aurelius forms a new military command, the praetentura Italiae et Alpium. Aquileia is relieved, and the Marcomanni are evicted from Roman territory.
- Marcus Aurelius signs a peace treaty with the Quadi and the Sarmatian Iazyges. The Germanic tribes of the Hasdingi (Vandals) and the Lacringi become Roman allies.
- Armenia and Mesopotamia become protectorates of the Roman Empire.
- The Costoboci cross the Danube (Dacia) and ravage Thrace in the Balkan Peninsula. They reach Eleusis, near Athens, and destroy the temple of the Eleusinian Mysteries.
- In May or June, the orator Aelius Aristides delivers a public speech in Smyrna, lamenting the damage recently inflicted to the sacred site of Eleusis.
- Sima Lang, Han dynasty official (d. 217)
- Tian Yu, general of the Cao Wei state in the Three Kingdoms period (d. 252)
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