|Centuries:||3rd century – 4th century – 5th century|
|Decades:||340s 350s 360s – 370s – 380s 390s 400s|
|Years:||374 375 376 – 377 – 378 379 380|
|377 by topic|
|State leaders – Sovereign states|
|Birth and death categories|
|Births – Deaths|
|Establishment and disestablishment categories|
|Establishments – Disestablishments|
|Ab urbe condita||1130|
|Bahá'í calendar||−1467 – −1466|
|English Regnal year||N/A|
|Chinese calendar||丙子年 (Fire Rat)
3073 or 3013
— to —
丁丑年 (Fire Ox)
3074 or 3014
|- Vikram Samvat||433–434|
|- Shaka Samvat||299–300|
|- Kali Yuga||3478–3479|
|Igbo calendar||−623 – −622|
|Iranian calendar||245 BP – 244 BP|
|Islamic calendar||253 BH – 252 BH|
|Minguo calendar||1535 before ROC
|Thai solar calendar||920|
|Wikimedia Commons has media related to 377.|
Year 377 (CCCLXXVII) 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 Augustus and Merobaudes (or, less frequently, year 1130 Ab urbe condita). The denomination 377 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.
- Gothic War: Famine in Lower Moesia occupied by the Goths takes a fearsome toll. Fritigern and his followers appeal for help, but the governors Lupicinus and Maximus regard them as second-class citizens. Little help is forthcoming, and thousands starve to death. The pressure on the Roman frontier is still severe with the Taifali and other hostile bands of Goths on the Danube. In addition groups of Huns and Alans have also moved up to the river.
- Emperor Valens requests his nephew Gratian to send Roman troops against the Goths. He responds by sending the ageing General Frigeridus with elite reinforcements that Ammianus calls ‘Pannonian and Transalpine auxiliaries (Pannonicis et Transalpinis auxiliis).’ Gratian sends also Richomeres, his Frankish commander of household troops (comes domesticorum), at the head of a number of troops drawn from the Gallic field army.
- Battle of the Willows: The Romans abandon the guerrilla strategy and are attacked by the Goths. The battle is indecisive but both sides suffer heavy casualties. The only Roman army available to face the Goths is no longer a fighting force. Richomeres withdraw his troops south of Marcianople (Bulgaria).
- Valens sends Saturninus (Master of the horse) to the Balkan Mountains to block the passes. These efforts are possibly supported by units of limitanei (light infantry) withdrawn from areas under Goth control. Split into small bands and unable to join the Tervingi in sufficient strength to overcome the Roman cordon the Goths grow increasingly desperate.
- The Goths (possibly Greuthungi) make an alliance with some of the Huns and Alans along the Danube, and entice them across the river. With the balance of power now shifted Saturninus concentrates his forces to avoid his outposts being overrun. This opens the passes allowing the Goths, Huns and Alans to break out into the lowlands of southern Thrace.
- Autumn – Bands of predatory "barbarians" spread throughout the province in search of food, supplies and booty. Most Roman troops are bottled up in the towns. Some elite units remain in the field and skirmish with the Goths. One such action takes place outside the town of Dibaltum. The Scutarii heavy cavalry is destroyed in a mad charge against the Goths.
- The Goths, now seeking a military victory to force the Empire to make terms, aim to dislodge the army of Frigeridus from Beroea. He withdraws over the Succi (Ihtiman) Pass back to Illyrium and reports to Gratian that an expedition by the main imperial armies is required to repulse the Goths in Thrace.
- Valens concludes a peace with the Persian Empire and leaves enough troops to defend the eastern frontier. The Saracens under queen Mavia revolt and devastate a swath of territory stretching from Phoenicia and Palestine as far as the Sinai (Egypt). Valens successfully brings the uprising under control.
- Gratian declares heretics to be enemies of the Roman Catholic Church.
Arts and sciences
- Arcadius, Roman Emperor (approximate date)
- Euthymius the Great, abbot and bishop (d. 473)
- Valerian of Abbenza, bishop and saint (d. 457)
- Farnobius, Gothic chieftain