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|Gregorian calendar||AD 80|
|Ab urbe condita||833|
|Balinese saka calendar||1–2|
|Chinese calendar||己卯年 (Earth Rabbit)|
2776 or 2716
— to —
庚辰年 (Metal Dragon)
2777 or 2717
|Coptic calendar||−204 – −203|
|- Vikram Samvat||136–137|
|- Shaka Samvat||1–2|
|- Kali Yuga||3180–3181|
|Iranian calendar||542 BP – 541 BP|
|Islamic calendar||559 BH – 558 BH|
|Julian calendar||AD 80|
|Minguo calendar||1832 before ROC|
|Seleucid era||391/392 AG|
|Thai solar calendar||622–623|
206 or −175 or −947
— to —
207 or −174 or −946
AD 80 (LXXX) was a leap year starting on Saturday (link will display the full calendar) of the Julian calendar. At the time, it was known as the Year of the Consulship of Augustus and Domitianus (or, less frequently, year 833 Ab urbe condita). The denomination AD 80 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 Titus completes and inaugurates the Colosseum with 100 days of games.
- The earliest stage of Lullingstone Roman villa is built.
- The Roman occupation of Britain reaches the River Tyne–Solway Firth frontier area. Gnaeus Julius Agricola creates a fleet for the conquest of Caledonia; he finally proves that Britannia is an island.
- Legio II Adiutrix is stationed at Lindum Colonia (modern Lincoln). The city is an important settlement for retired Roman legionaries.
- The original Roman Pantheon is destroyed in a fire, along with many other buildings.
- The Eifel Aqueduct is constructed to bring water 95 km (59 mi) from the Eifel region to Colonia Claudia Ara Agrippinensum (modern Cologne).
- Some 30,000 Asian tribesmen migrate from the steppes to the west with 40,000 horses and 100,000 cattle, joining with Iranian tribesmen and with Mongols from the Siberian forests to form a group that will be known in Europe as the Huns.
- King Pasa becomes ruler of the Korean kingdom of Silla.
Art and Science
- Aspasius, Greek philosopher and writer (approximate date)
- Aśvaghoṣa, Indian philosopher and poet (d. c. 150)
- Yin, Chinese empress of the Han Dynasty (d. 103)
- Kujula Kadphises, Kushan prince (approximate date)
- Lucius Vipstanus Messalla, Roman politician
- Philip the Apostle, Roman bishop and martyr
- Talhae of Silla, Korean ruler of Silla
- Vologases II, king of the Parthian Empire
- Zhao Xi, Chinese politician (b. AD 4)