|Millennium:||1st millennium BC|
|Centuries:||5th century BC – 4th century BC – 3rd century BC|
|Decades:||400s BC 390s BC 380s BC – 370s BC – 360s BC 350s BC 340s BC|
|Years:||380 BC 379 BC 378 BC – 377 BC – 376 BC 375 BC 374 BC|
|377 BC by topic|
|Gregorian calendar||377 BC|
|Ab urbe condita||377|
|Bahá'í calendar||−2220 – −2219|
|English Regnal year||N/A|
|Chinese calendar||癸卯年 (Water Rabbit)
2320 or 2260
— to —
甲辰年 (Wood Dragon)
2321 or 2261
|Coptic calendar||−660 – −659|
|Ethiopian calendar||−384 – −383|
|- Vikram Samvat||−320 – −319|
|- Shaka Samvat||N/A|
|- Kali Yuga||2725–2726|
|Igbo calendar||−1376 – −1375|
|Iranian calendar||998 BP – 997 BP|
|Islamic calendar||1029 BH – 1028 BH|
|Minguo calendar||2288 before ROC
|Thai solar calendar||167|
|Wikimedia Commons has media related to 377 BC.|
Year 377 BC was a year of the pre-Julian Roman calendar. At the time, it was known as the Year of the Tribunate of Mamercinus, Poplicola, Cicurinus, Rufus (or Praetextatus), Cincinnatus and Cincinnatus (or, less frequently, year 377 Ab urbe condita). The denomination 377 BC 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.
- Timotheus wins over the Acarnanians and Molossians as friends of Athens.
- Athens, in preparing for participation in the Spartan-Theban struggle, reorganises its finances and its taxation, inaugurating a system whereby the richer citizens are responsible for the collection of taxes from the less rich.
- The Peace of Antalcidas (387 BC), includes a clause guaranteeing the Greek cities their independence. The Spartan King Agesilaus II uses this clause as an excuse to force the dissolution of Thebes' Boeotian League. In two sieges, he reduces Thebes to near starvation.
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