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|Millennium:||1st millennium BC|
|377 BC by topic|
|Gregorian calendar||377 BC
|Ab urbe condita||377|
|Ancient Egypt era||XXX dynasty, 4|
|- Pharaoh||Nectanebo I, 4|
|Ancient Greek era||100th Olympiad, year 4|
|Balinese saka calendar||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||2724–2725|
|Iranian calendar||998 BP – 997 BP|
|Islamic calendar||1029 BH – 1028 BH|
|Minguo calendar||2288 before ROC
|Thai solar calendar||166–167|
−250 or −631 or −1403
— to —
−249 or −630 or −1402
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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