366 BC

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Millennium: 1st millennium BC
366 BC in various calendars
Gregorian calendar366 BC
Ab urbe condita388
Ancient Egypt eraXXX dynasty, 15
- PharaohNectanebo I, 15
Ancient Greek era103rd Olympiad, year 3
Assyrian calendar4385
Balinese saka calendarN/A
Bengali calendar−958
Berber calendar585
Buddhist calendar179
Burmese calendar−1003
Byzantine calendar5143–5144
Chinese calendar甲寅年 (Wood Tiger)
2331 or 2271
    — to —
乙卯年 (Wood Rabbit)
2332 or 2272
Coptic calendar−649 – −648
Discordian calendar801
Ethiopian calendar−373 – −372
Hebrew calendar3395–3396
Hindu calendars
 - Vikram Samvat−309 – −308
 - Shaka SamvatN/A
 - Kali Yuga2735–2736
Holocene calendar9635
Iranian calendar987 BP – 986 BP
Islamic calendar1017 BH – 1016 BH
Javanese calendarN/A
Julian calendarN/A
Korean calendar1968
Minguo calendar2277 before ROC
Nanakshahi calendar−1833
Thai solar calendar177–178
Tibetan calendar阳木虎年
(male Wood-Tiger)
−239 or −620 or −1392
    — to —
(female Wood-Rabbit)
−238 or −619 or −1391

Year 366 BC was a year of the pre-Julian Roman calendar. At the time, it was known as the Year of the Consulship of Mamercinus and Lateranus (or, less frequently, year 388 Ab urbe condita). The denomination 366 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.


By place[edit]

Persian Empire[edit]


  • Athens founds the town of Kos on the island of Kos in the Aegean Sea.
  • Theban leader, Epaminondas, returns to the Peloponnesus for a third time, seeking to secure the allegiance of the states of Achaea. Although no army dares to challenge him in the field, the democratic governments he establishes there are short-lived, as pro-Spartan aristocrats soon return to the cities, reestablish the oligarchies, and bind their cities ever more closely to Sparta.
  • Thebes makes peace with Sparta and then turns its attention on Athens, which is trying to revive its maritime empire and is interfering in Macedonian dynastic quarrels.
  • Thebes captures the city of Oropus.


  • The experiment by Dion (brother-in-law of Dionysius I) and Plato to educate the new ruler of Syracuse, Dionysius II, in the practical application of Plato's philosophical principles fails and Dion and Plato are banished from Syracuse.

Roman Republic[edit]

  • The use of military tribunes with consular power is abandoned permanently and the dual consulship is restored. A new magistracy is established, which is called the praetorship. Its holder, the praetor, is elected annually by the Assembly and takes charge of civil matters, thus relieving the consuls of this responsibility. The praetor is regarded as a junior colleague of the consuls. Nevertheless, the praetor can command an army, convene a Senate or an assembly, as well as exercise the consular functions.
  • Two additional aediles, called curule ("higher") aediles, are created in the Roman hierarchy. These are at first patricians; but those of the next year are plebeians and so on year by year alternately. They are elected in the assembly of the tribes, with the consul presiding.

By topic[edit]