418 BC

Centuries:	6th century BC - 5th century BC - 4th century BC
Decades:	440s BC 430s BC 420s BC - 410s BC - 400s BC 390s BC 380s BC
Years:	421 BC 420 BC 419 BC - 418 BC - 417 BC 416 BC 415 BC

418 BC by topic
Politics
State leaders - Sovereign states
Birth and death categories
Births - Deaths
Establishments and disestablishments categories
Establishments - Disestablishments v • d • e

**418 BC in other calendars**
Gregorian calendar	418 BC
Ab urbe condita	336
Armenian calendar	N/A
Bahá'í calendar	-2261 – -2260
Berber calendar	533
Buddhist calendar	127
Burmese calendar	-1055
Chinese calendar	2219/2279 ([[Sexagenary cycle\|]]年) — to — 2220/2280 ([[Sexagenary cycle\|]]年)
Coptic calendar	-701 – -700
Ethiopian calendar	-425 – -424
Hebrew calendar	3343 – 3344
Hindu calendars
- Vikram Samvat	-362 – -361
- Shaka Samvat	N/A
- Kali Yuga	2684 – 2685
Holocene calendar	9583
Iranian calendar	1039 BP – 1038 BP
Islamic calendar	1071 BH – 1070 BH
Japanese calendar
Korean calendar	1916
Thai solar calendar	126
v • d • e

[edit] Events

King Agis II of Sparta escapes having his house razed and being fined 100,000 drachmae for his failure to press his advantage by promising more successful outcomes in the future.
The Battle of Mantinea is the largest land battle of the Peloponnesian War (with as many as 10,000 troops on each side). Sparta under King Agis II has a major victory over Argos (and its allies Athens, Ellis and Mantinea), which has broken its treaty with Sparta's King Agis II at the insistence of Alcibiades. Agis II's major victory makes amends with the Spartans for his earlier truce with Argos. The commander of the Athenian forces, Laches, is killed in the battle.
Impressed with the Spartan victory, the inhabitants of Argos change their government from democracy to oligarchy and end their support for Athens in favour of an alliance with Sparta. Many of Argos' allies do the same. Athens becomes increasingly isolated.
Alcibiades urges the Athenians to conquer Syracuse, subdue Sicily and Carthage and thus gain added forces that will enable them to finish the war against Sparta. His bold offensive plan wins the support of the Athenians.