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|Centuries:||1st century – 2nd century – 3rd century|
|Decades:||160s 170s 180s – 190s – 200s 210s 220s|
|Years:||195 196 197 – 198 – 199 200 201|
|198 by topic|
|State leaders – Sovereign states|
|Birth and death categories|
|Births – Deaths|
|Establishment and disestablishment categories|
|Establishments – Disestablishments|
|Ab urbe condita||951|
|Chinese calendar||丁丑年 (Fire Ox)
2894 or 2834
— to —
戊寅年 (Earth Tiger)
2895 or 2835
|Coptic calendar||−86 – −85|
|- Vikram Samvat||254–255|
|- Shaka Samvat||119–120|
|- Kali Yuga||3298–3299|
|Iranian calendar||424 BP – 423 BP|
|Islamic calendar||437 BH – 436 BH|
|Minguo calendar||1714 before ROC
|Seleucid era||509/510 AG|
|Thai solar calendar||740–741|
Year 198 (CXCVIII) was a common year starting on Sunday (link will display the full calendar) of the Julian calendar. At the time, it was known as the Year of the Consulship of Sergius and Gallus (or, less frequently, year 951 Ab urbe condita). The denomination 198 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.
- Publius Septimius Geta, son of Septimius Severus, receives the title of Caesar.
- Caracalla, son of Septimius Severus, is given the title of Augustus.
- Chinese warlord Cao Cao defeats Lü Bu in the Battle of Xiapi; afterwards Cao Cao has Lü Bu executed.
- Mark I succeeds Olympians as Patriarch of Constantinople.
- Li Jue, general under Dong Zhuo
- Mi Heng, renowned scholar and friend of Kong Rong (executed by Huang Zu) (b. 173)
- Yang Chou, Chinese general (b. 159)
- Zhang Yang, Chinese warlord