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|200 by topic|
|Ab urbe condita||953|
|Balinese saka calendar||121–122|
|Chinese calendar||己卯年 (Earth Rabbit)|
2896 or 2836
— to —
庚辰年 (Metal Dragon)
2897 or 2837
|Coptic calendar||−84 – −83|
|- Vikram Samvat||256–257|
|- Shaka Samvat||121–122|
|- Kali Yuga||3300–3301|
|Iranian calendar||422 BP – 421 BP|
|Islamic calendar||435 BH – 434 BH|
|Minguo calendar||1712 before ROC|
|Seleucid era||511/512 AG|
|Thai solar calendar||742–743|
326 or −55 or −827
— to —
327 or −54 or −826
Year 200 (CC) was a leap 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 Victorinus (or, less frequently, year 953 Ab urbe condita). The denomination 200 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.
- Human population reaches about 257 million.
- Emperor Septimius Severus visits the provinces of Syria, Palestine, and Arabia.
- Palestine, benefiting from the benevolent policies of Severus, has a significant economic revival.
- The province of Numidia is taken from the African proconsul and made an Impeprial province.
- The Chinese warlord Cao Cao defeats his rival Yuan Shao at the Battle of Guandu.
- In Japan, Himiko, whose capital is situated in Yamatai, extends her authority over a number of clans.
- The Classic Age of Maya civilization begins (around this year).
- The Paracas culture in the Andes ends (around this year).
- The Severan Tondo, depicting Septimius Severus, Julia Domna and their children Geta and Caracalla, from Fayum, Egypt, is made. It is now kept at Staatliche Museen zu Berlin, Preussischer Kulturbesitz, Antikensammlung.
- Jewish Eretz Yisraeli scholar Judah ha-Nasi compiles tracts of the Mishnah, creating of Talmudic law.
- Clement of Alexandria denounces the use of musical instruments instead of human voices in Christian music.
- Brahmanism evolves into Hinduism (approximate date).
- Diophantus, Greek mathematician
- Marcus Claudius Tacitus, Roman Emperor (d. 276)
- Valerian I, Roman Emperor (d. 260/264)
- Sun Ce, Chinese warlord who laid the foundation for the Eastern Wu state in the Three Kingdoms period (b. 175)
- Xu Gong, Chinese commandery administrator
- Zheng Xuan, Chinese scholar (b. 127)