434 BC

Millennium:	1st millennium BC
Centuries:	6th century BC – 5th century BC – 4th century BC
Decades:	460s BC  450s BC  440s BC  – 430s BC –  420s BC  410s BC  400s BC
Years:	437 BC 436 BC 435 BC – 434 BC – 433 BC 432 BC 431 BC

434 BC in other calendars

Gregorian calendar	434 BC CDXXXIII BC
Ab urbe condita	320
Ancient Egypt era	XXVII dynasty, 92
- Pharaoh	Artaxerxes I of Persia, 32
Ancient Greek era	86th Olympiad, year 3
Assyrian calendar	4317
Bengali calendar	−1026
Berber calendar	517
Buddhist calendar	111
Burmese calendar	−1071
Byzantine calendar	5075–5076
Chinese calendar	丙午年 (Fire Horse) 2263 or 2203     — to — 丁未年 (Fire Goat) 2264 or 2204
Coptic calendar	−717 – −716
Discordian calendar	733
Ethiopian calendar	−441 – −440
Hebrew calendar	3327–3328
Hindu calendars
- Vikram Samvat	−377 – −376
- Shaka Samvat	N/A
- Kali Yuga	2668–2669
Holocene calendar	9567
Iranian calendar	1055 BP – 1054 BP
Islamic calendar	1087 BH – 1086 BH
Julian calendar	N/A
Korean calendar	1900
Minguo calendar	2345 before ROC 民前2345年
Thai solar calendar	109–110

Year 434 BC was a year of the pre-Julian Roman calendar. At the time, it was known as the Second year of the Consulship of Iullus and Tricostus or the Year of the Consulship of Capitolinus and Praetextatus and the Year of the Tribunate of Cossus, Praetextatus and Capitolinus (or, less frequently, year 320 Ab urbe condita). The denomination 434 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

• Under the leadership of Pericles, Athens introduces a series of measures (the "Megarian decree") imposing an economic embargo on Megara for violations of land sacred to Demeter. According to the provisions of the decree, Megarian merchants are to be excluded from the market of Athens and the ports in its empire. This ban strangles the Megarian economy and strains the fragile peace between Athens and Sparta, which is allied with Megara.
• Philip, brother of Perdiccas II of Macedon challenges Perdiccas for the throne, and enlists the support of Athens and King Derdas of Elimea. Perdiccas responds by stirring up rebellion in a number of Athenian tribute cities, including Potidaea.
• Anaxagoras is arrested by Pericles' political opponents on a charge of contravening the established dogmas of Athenian religion. It needs Pericles' power of oratory and persuasion to secure his release. Even so he is fined and forced to retire from Athens to Lampsacus in Ionia.

By topic

Mathematics

• While in prison, Anaxagoras tries to square the circle with straightedge and compasses.