418 BC

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Millennium: 1st millennium BC
418 BC in various calendars
Gregorian calendar418 BC
Ab urbe condita336
Ancient Egypt eraXXVII dynasty, 108
- PharaohDarius II of Persia, 6
Ancient Greek era90th Olympiad, year 3
Assyrian calendar4333
Balinese saka calendarN/A
Bengali calendar−1010
Berber calendar533
Buddhist calendar127
Burmese calendar−1055
Byzantine calendar5091–5092
Chinese calendar壬戌年 (Water Dog)
2279 or 2219
    — to —
癸亥年 (Water Pig)
2280 or 2220
Coptic calendar−701 – −700
Discordian calendar749
Ethiopian calendar−425 – −424
Hebrew calendar3343–3344
Hindu calendars
 - Vikram Samvat−361 – −360
 - Shaka SamvatN/A
 - Kali Yuga2683–2684
Holocene calendar9583
Iranian calendar1039 BP – 1038 BP
Islamic calendar1071 BH – 1070 BH
Javanese calendarN/A
Julian calendarN/A
Korean calendar1916
Minguo calendar2329 before ROC
Nanakshahi calendar−1885
Thai solar calendar125–126
Tibetan calendar阳水狗年
(male Water-Dog)
−291 or −672 or −1444
    — to —
(female Water-Pig)
−290 or −671 or −1443

Year 418 BC was a year of the pre-Julian Roman calendar. At the time, it was known as the Year of the Tribunate of Fidenas, Axilla and Mugillanus (or, less frequently, year 336 Ab urbe condita). The denomination 418 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]


  • 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.