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|Millennium:||1st millennium BC|
|370 BC by topic|
|Gregorian calendar||370 BC|
|Ab urbe condita||384|
|Ancient Egypt era||XXX dynasty, 11|
|- Pharaoh||Nectanebo I, 11|
|Ancient Greek era||102nd Olympiad, year 3|
|Balinese saka calendar||N/A|
|Chinese calendar||庚戌年 (Metal Dog)|
2327 or 2267
— to —
辛亥年 (Metal Pig)
2328 or 2268
|Coptic calendar||−653 – −652|
|Ethiopian calendar||−377 – −376|
|- Vikram Samvat||−313 – −312|
|- Shaka Samvat||N/A|
|- Kali Yuga||2731–2732|
|Iranian calendar||991 BP – 990 BP|
|Islamic calendar||1021 BH – 1020 BH|
|Minguo calendar||2281 before ROC|
|Thai solar calendar||173–174|
−243 or −624 or −1396
— to —
−242 or −623 or −1395
Year 370 BC was a year of the pre-Julian Roman calendar. At the time, it was known as the Year of the Tribunate of Capitolinus, Medullinus, Praetextatus, Cornelius, Volusus and Poplicola (or, less frequently, year 384 Ab urbe condita). The denomination 370 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.
- The Spartans under King Agesilaus II invade Arcadia. After appealing in vain to the Athenians for help, Arcadia turns to the Thebans. Epaminondas of Thebes arrives with an army, finds that the Spartans have retired and follows them.
- With the support of Thebes, the Arcadian capital city of Megalopolis is completed and a democratic system is set up with an Assembly of Ten Thousand and a Council of fifty.
- The tagus of Thessaly, Jason of Pherae, dies, after making Thessaly a powerful force in Greek politics.
- Eudoxus of Cnidus develops the method of exhaustion for mathematically determining the area under a curve.
- Marcus Valerius Corvus, Roman hero (d. c. 270 BC)
- Theophrastus, Greek philosopher, a native of Eressos in Lesbos, the successor of Aristotle in the Peripatetic school (d. c. 285 BC)
- Agesipolis II, Agiad king of Sparta
- Democritus of Abdera, Greek philosopher (approximate date) (b. c. 460 BC)
- Hippocrates of Cos, Greek physician (b. c. 460 BC)
- Jason of Pherae, ruler of Thessaly