|Centuries:||3rd century – 4th century – 5th century|
|Decades:||350s 360s 370s – 380s – 390s 400s 410s|
|Years:||384 385 386 – 387 – 388 389 390|
|387 by topic|
|State leaders – Sovereign states|
|Birth and death categories|
|Births – Deaths|
|Establishment and disestablishment categories|
|Establishments – Disestablishments|
|Ab urbe condita||1140|
|Chinese calendar||丙戌年 (Fire Dog)
3083 or 3023
— to —
丁亥年 (Fire Pig)
3084 or 3024
|- Vikram Samvat||443–444|
|- Shaka Samvat||309–310|
|- Kali Yuga||3488–3489|
|Iranian calendar||235 BP – 234 BP|
|Islamic calendar||242 BH – 241 BH|
|Minguo calendar||1525 before ROC
|Seleucid era||698/699 AG|
|Thai solar calendar||929–930|
Year 387 (CCCLXXXVII) was a common year starting on Friday (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 Eutropius (or, less frequently, year 1140 Ab urbe condita). The denomination 387 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.
- Spring – Emperor Theodosius I increases the taxes in Antioch. A peasant uprising starts a riot and sets fire to public buildings. Theodosius sends imperial troops to quell the disturbance, and closes the public baths and theatres.
- Magnus Maximus, usurping emperor of the West, invades Italy. Emperor Valentinian II, age 16, is forced out of Rome. He flees with his mother Justina and sisters to Thessaloniki (Thrace).
- Winter – The widowed emperor Theodosius I takes Valentinian II in protection and marries his sister Flavia Galla.
- Peace of Acilisene: King Shapur III signs a treaty with Theodosius I. Armenia is divided in two kingdoms, and becomes a vassal state of the Roman Empire and Persia.
Arts and sciences
- Oribase, Greek doctor, publishes a treatise on paralysis and bleedings.
- Aelia Flaccilla, Roman Empress and wife of Theodosius I
- Alatheus, chieftain of the Ostrogoths
- Saint Monica, mother of Augustine of Hippo