340 BC

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Millennium: 1st millennium BC
340 BC in various calendars
Gregorian calendar340 BC
Ab urbe condita414
Ancient Egypt eraXXXI dynasty, 4
- PharaohArtaxerxes III of Persia, 4
Ancient Greek era110th Olympiad (victor
Assyrian calendar4411
Balinese saka calendarN/A
Bengali calendar−932
Berber calendar611
Buddhist calendar205
Burmese calendar−977
Byzantine calendar5169–5170
Chinese calendar庚辰年 (Metal Dragon)
2358 or 2151
    — to —
辛巳年 (Metal Snake)
2359 or 2152
Coptic calendar−623 – −622
Discordian calendar827
Ethiopian calendar−347 – −346
Hebrew calendar3421–3422
Hindu calendars
 - Vikram Samvat−283 – −282
 - Shaka SamvatN/A
 - Kali Yuga2761–2762
Holocene calendar9661
Iranian calendar961 BP – 960 BP
Islamic calendar991 BH – 990 BH
Javanese calendarN/A
Julian calendarN/A
Korean calendar1994
Minguo calendar2251 before ROC
Nanakshahi calendar−1807
Thai solar calendar203–204
Tibetan calendar阳金龙年
(male Iron-Dragon)
−213 or −594 or −1366
    — to —
(female Iron-Snake)
−212 or −593 or −1365

Year 340 BC was a year of the pre-Julian Roman calendar. At the time it was known as the Year of the Consulship of Torquatus and Mus (or, less frequently, year 414 Ab urbe condita). The denomination 340 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]



  • Hicetas, the tyrant of Leontini, again persuades Carthage to send a large army to Sicily, which lands at Lilybaeum. Timoleon of Syracuse meets this large Carthaginian army in the Battle of the Crimissus in the west of Sicily and achieves a brilliant victory against superior odds. Despite this victory, the Carthaginians continue to occupy the western half of Sicily, with a treaty being concluded that confines the Carthaginians to the area west of the Halycus (Platani) River.

Roman Republic[edit]

  • An embassy is sent by the Latin peoples to the Roman Senate asking for the formation of a single republic between Rome and Latium, in which both parties would be considered to be equal. As Rome considers that it is the leader of the Latin League, it refuses to treat the Latin people as being equal politically, or to have Latin people in the Roman Senate. With Rome's refusal of the proposal, the Latin War begins. The Latins fight with the Campanians, while Rome joins the Samnites to attack the Latins. Only the Laurentes in Latium and the equites of Campania remain with the Romans, who, for their part, find support among the Paeligni.
  • The Roman-Samnite army under consuls Publius Decius Mus and Titus Manlius Torquatus attack and defeat the Latins and Campanians near Mount Vesuvius in the Battle of Vesuvius.
  • The Romans succeed in detaching the Campanians from their alliance with the Latins (through their fear of the Samnites) and induce them to make a separate peace. Three Campanian cities, including Capua and Cumae, are granted Roman citizenship and thus become part of the Roman state. The Roman state now extends to the Bay of Naples.