312 BC: Information from Answers.com

Millennium:	1st millennium BC
Centuries:	5th century BC – 4th century BC – 3rd century BC
Decades:	340s BC 330s BC 320s BC – 310s BC – 300s BC 290s BC 280s BC
Years:	315 BC 314 BC 313 BC – 312 BC – 311 BC 310 BC 309 BC

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

**312 BC in other calendars**
Gregorian calendar	312 BC
Ab urbe condita	442
Armenian calendar	N/A
Bahá'í calendar	-2155 – -2154
Berber calendar	639
Buddhist calendar	233
Burmese calendar	-949
Byzantine calendar	5197 – 5198
Chinese calendar	[[Sexagenary cycle\|]]年 (2325/2385) — to — [[Sexagenary cycle\|]]年 (2326/2386)
Coptic calendar	-595 – -594
Ethiopian calendar	-319 – -318
Hebrew calendar	3449 – 3450
Hindu calendars
- Vikram Samvat	-256 – -255
- Shaka Samvat	N/A
- Kali Yuga	2790 – 2791
Holocene calendar	9689
Iranian calendar	933 BP – 932 BP
Islamic calendar	962 BH – 961 BH
Japanese calendar
Korean calendar	2022
Thai solar calendar	232
v • d • e

Events

Ptolemy and Seleucus, the satrap of Babylonia, invade the satrapy of Syria. The resulting Battle of Gaza leads to a triumph for Ptolemy and Seleucus over Antigonus' son, Demetrius Poliorcetes ("sieger of cities"), who is captured but immediately released. Seleucus ceases his service to Ptolemy and returns to his former province, Babylonia. This event takes place on October 1 and becomes the starting point of the Seleucid era.

The Syracusans ask for help against their tyrant Agathocles from the Carthaginians, who, fearing for their own possessions in Sicily, send a large force to the island.

The Roman censor, Appius Claudius Caecus, a patrician, enters office and begins construction of the Appian Way (the Via Appia) between Rome and Capua. He also embarks on a program of political reform, including the distribution of the landless citizens of Rome among the tribes, which at this time constitute basic political units. Appius also admits sons of freedmen into the Roman Senate. He also asserts the right of freed slaves to hold office.
Rome gets its first pure drinking water as engineers complete the first aqueduct into the city, the Aqua Appia.

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