|Centuries:||3rd century – 4th century – 5th century|
|Decades:||340s 350s 360s – 370s – 380s 390s 400s|
|Years:||367 368 369 – 370 – 371 372 373|
|370 by topic|
|State leaders – Sovereign states|
|Birth and death categories|
|Births – Deaths|
|Establishment and disestablishment categories|
|Establishments – Disestablishments|
|Ab urbe condita||1123|
|Chinese calendar||己巳年 (Earth Snake)
3066 or 3006
— to —
庚午年 (Metal Horse)
3067 or 3007
|- Vikram Samvat||426–427|
|- Shaka Samvat||292–293|
|- Kali Yuga||3471–3472|
|Iranian calendar||252 BP – 251 BP|
|Islamic calendar||260 BH – 259 BH|
|Minguo calendar||1542 before ROC
|Seleucid era||681/682 AG|
|Thai solar calendar||912–913|
|Wikimedia Commons has media related to 370.|
Year 370 (CCCLXX) 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 Valens (or, less frequently, year 1123 Ab urbe condita). The denomination 370 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.
- The presence of the Saxons in Batavia is noted by Ammianus Marcellinus. They renew their attacks in northern Gaul. After modest success, a truce is signed and emperor Valentinian I orders the Saxons to join the Roman army.
- Law of Valentinian I and Valens bans marriages between Romans and barbarians under penalty of death.
- An edict issued by Valentinian I and Valens bans the importation of wine and olive oil from areas controlled by the barbarians.
- The Huns migrate westward from the Volga into Europe, and subjugate the Alans and the Ostrogoths. With their arrival, a tradition of composite bows is introduced.
- Athanaric, Gothic leader of the Tervingi, advanced eastwards and takes up a defensive position along the banks of the Dniester (Romania).
- Basil the Great becomes bishop of Caesarea (Cappadocia).
- Demophilus of Constantinople becomes Patriarch of Constantinople, although his position is disputed by Evagrius of Constantinople.
- John Chrysostom is baptized.
- Alaric I, king of the Visigoths (d. 410)
- Saint Brice, bishop of Tours (d. 444)
- Hypatia, female mathematician and philosopher (approximate date)
- Eudoxius of Antioch, Patriarch of Constantinople
- Lucifer Calaritanus, founder of the Luciferian sect (approximate date)
- Imperatores Valentinianus, Valens, Gratianus . Ad barbaricum transferendi vini et olei et liquaminis nullam quisquam habeat facultatem ne gustus quidem causa aut usus commerciorum. * VALENTIN. VALENS ET GRAT. AAA. AD THEODOTUM MAG. MIL.