340

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Calendar year

Millennium:	1st millennium
Centuries:	3rd century 4th century 5th century
Decades:	320s 330s 340s 350s 360s
Years:	337 338 339 340 341 342 343
v t e

340 by topic
Leaders
Political entities State leaders Religious leaders
Categories
Births Deaths Disestablishments
v t e

340 in various calendars

Gregorian calendar 340
CCCXL

Ab urbe condita 1093

Assyrian calendar 5090

Balinese saka calendar 261–262

Bengali calendar −254 – −253

Berber calendar 1290

Buddhist calendar 884

Burmese calendar −298

Byzantine calendar 5848–5849

Chinese calendar 己亥年 (Earth Pig)
3037 or 2830
— to —
庚子年 (Metal Rat)
3038 or 2831

Coptic calendar 56–57

Discordian calendar 1506

Ethiopian calendar 332–333

Hebrew calendar 4100–4101

Hindu calendars

- Vikram Samvat 396–397

- Shaka Samvat 261–262

- Kali Yuga 3440–3441

Holocene calendar 10340

Iranian calendar 282 BP – 281 BP

Islamic calendar 291 BH – 290 BH

Javanese calendar 221–222

Julian calendar 340
CCCXL

Korean calendar 2673

Minguo calendar 1572 before ROC
民前1572年

Nanakshahi calendar −1128

Seleucid era 651/652 AG

Thai solar calendar 882–883

Tibetan calendar 阴土猪年
(female Earth-Pig)
466 or 85 or −687
— to —
阳金鼠年
(male Iron-Rat)
467 or 86 or −686

Year 340 (CCCXL ) was a leap year starting on Tuesday of the Julian calendar. At the time, it was known as the Year of the Consulship of Acindynus and Valerius (or, less frequently, year 1093 Ab urbe condita ). The denomination 340 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

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By place

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Roman Empire

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Constantinople, capital of Emperor Constantius II, becomes the largest city in the world, taking the lead from Rome, capital of his brother Constans I.^[1]
Constantine II, emperor of the western part of the Roman Empire (Britain, Gaul, the Rhine provinces and Iberia), crosses the Alps and attacks the army of his brother Constans I, emperor of the central part of the Roman Empire (Upper Danube, Italy and middle Africa). They clash at Aquileia in northern Italy. Constantine is killed in a skirmish by an ambush of Constans' troops.
Constans is left sole ruler of the Western part of the Roman Empire, with his other brother, Constantius II, emperor of the Eastern portion.