378 BC

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:	381 BC 380 BC 379 BC – 378 BC – 377 BC 376 BC 375 BC

378 BC by topic

Politics

State leaders – Sovereign states

Birth and death categories

Births – Deaths

Establishments and disestablishments categories

Establishments – Disestablishments

378 BC in other calendars

Gregorian calendar	378 BC
Ab urbe condita	376
Armenian calendar	N/A
Assyrian calendar	4373
Bahá'í calendar	-2221–-2220
Bengali calendar	-970
Berber calendar	573
English Regnal year	N/A
Buddhist calendar	167
Burmese calendar	-1015
Byzantine calendar	5131–5132
Chinese calendar	壬寅年 (2259/2319) — to — 癸卯年 (2260/2320)
Coptic calendar	-661–-660
Ethiopian calendar	-385–-384
Hebrew calendar	3383–3384
Hindu calendars
- Vikram Samvat	-321–-320
- Shaka Samvat	N/A
- Kali Yuga	2724–2725
Holocene calendar	9623
Iranian calendar	999 BP – 998 BP
Islamic calendar	1030 BH – 1029 BH
Japanese calendar
Korean calendar	1956
Minguo calendar	2289 before ROC 民前2289年
Thai solar calendar	166

Year 378 BC was a year of the pre-Julian Roman calendar. At the time, it was known as the Year of the Tribunate of Medullinus, Fidenas, Lanatus, Siculus, Pulvillus and Macerinus (or, less frequently, year 376 Ab urbe condita). The denomination 378 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.

Events

By place

Greece

• The Theban general and statesman, Epaminondas, takes command of Thebes. Pelopidas is elected boeotarch, or chief magistrate, of the city.
• Timotheus, the son of the Athenian general Conon, is elected strategos of Athens.
• A Spartan attempt to seize Piraeus brings Athens closer to Thebes. The Athenian mercenary, Chabrias, defeats the Spartans in the battle. In fighting the battle, Chabrias invents a new defensive technique; he orders each soldier to receive a charge kneeling on his left knee, with his shield resting on the ground and spear pointed at the enemy.
• Athens allies itself with Thebes and forms the Second Athenian Empire. The confederacy includes most of the Boeotian cities and some of the Ionian islands.

Sicily

• Dionysius I's third war with Carthage proves disastrous. He suffers a crushing defeat at Cronium and is forced to pay an indemnity of 1,000 talents and cede the territory west of the Halycus River to the Carthaginians.