420 BC

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Calendar year

Millennium:	1st millennium BC
Centuries:	6th century BC 5th century BC 4th century BC
Decades:	440s BC 430s BC 420s BC 410s BC 400s BC
Years:	423 BC 422 BC 421 BC 420 BC 419 BC 418 BC 417 BC
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Politics
420 BC by topic
State leaders Political entities
Categories
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420 BC in various calendars

Gregorian calendar 420 BC
CDXX BC

Ab urbe condita 334

Ancient Egypt era XXVII dynasty, 106

- Pharaoh Darius II of Persia, 4

Ancient Greek era 90th Olympiad (victor )1

Assyrian calendar 4331

Balinese saka calendar N/A

Bengali calendar −1013 – −1012

Berber calendar 531

Buddhist calendar 125

Burmese calendar −1057

Byzantine calendar 5089–5090

Chinese calendar 庚申年 (Metal Monkey)
2278 or 2071
— to —
辛酉年 (Metal Rooster)
2279 or 2072

Coptic calendar −703 – −702

Discordian calendar 747

Ethiopian calendar −427 – −426

Hebrew calendar 3341–3342

Hindu calendars

- Vikram Samvat −363 – −362

- Shaka Samvat N/A

- Kali Yuga 2681–2682

Holocene calendar 9581

Iranian calendar 1041 BP – 1040 BP

Islamic calendar 1073 BH – 1072 BH

Javanese calendar N/A

Julian calendar N/A

Korean calendar 1914

Minguo calendar 2331 before ROC
民前2331年

Nanakshahi calendar −1887

Thai solar calendar 123–124

Tibetan calendar 阳金猴年
(male Iron-Monkey)
−293 or −674 or −1446
— to —
阴金鸡年
(female Iron-Rooster)
−292 or −673 or −1445

Year 420 BC was a year of the pre-Julian Roman calendar. The denomination 420 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

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By place

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Greece

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The young and popular Alcibiades is elected "Strategos" (one of a board of ten generals) and begins to dominate Athenian life and politics. A Quadruple Alliance of Athens, Argos, Mantineia and Elis, which has been organised by Alcibiades (in opposition to Nicias) confronts a Spartan-Boeotian alliance.
Around 420 BC, Spartans were excluded from participating in the Olympic Games due to their ongoing conflicts with other Greek city-states, violating a peace treaty. This exclusion was part of a broader effort to maintain the peaceful atmosphere of the games.^[1]