311 BC

Millennium:	1st millennium BC
Centuries:	5th century BC 4th century BC 3rd century BC
Decades:	330s BC 320s BC 310s BC 300s BC 290s BC
Years:	314 BC 313 BC 312 BC 311 BC 310 BC 309 BC 308 BC

311 BC in various calendars

Gregorian calendar	311 BC CCCXI BC
Ab urbe condita	443
Ancient Egypt era	XXXIII dynasty, 13
- Pharaoh	Ptolemy I Soter, 13
Ancient Greek era	117th Olympiad, year 2
Assyrian calendar	4440
Balinese saka calendar	N/A
Bengali calendar	−903
Berber calendar	640
Buddhist calendar	234
Burmese calendar	−948
Byzantine calendar	5198–5199
Chinese calendar	己酉年 (Earth Rooster) 2387 or 2180     — to — 庚戌年 (Metal Dog) 2388 or 2181
Coptic calendar	−594 – −593
Discordian calendar	856
Ethiopian calendar	−318 – −317
Hebrew calendar	3450–3451
Hindu calendars
- Vikram Samvat	−254 – −253
- Shaka Samvat	N/A
- Kali Yuga	2790–2791
Holocene calendar	9690
Iranian calendar	932 BP – 931 BP
Islamic calendar	961 BH – 960 BH
Javanese calendar	N/A
Julian calendar	N/A
Korean calendar	2023
Minguo calendar	2222 before ROC 民前2222年
Nanakshahi calendar	−1778
Seleucid era	1/2 AG
Thai solar calendar	232–233
Tibetan calendar	阴土鸡年 (female Earth-Rooster) −184 or −565 or −1337     — to — 阳金狗年 (male Iron-Dog) −183 or −564 or −1336

Year 311 BC was a year of the pre-Julian Roman calendar. At the time, it was known as the Year of the Consulship of Brutus and Barbula (or, less frequently, year 443 Ab urbe condita). The denomination 311 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

Seleucid Empire

• Seleucus reestablishes himself as satrap of Babylonia and asserts control over Media and Susiana (Elam).

Asia Minor and Syria

• Ptolemy tries to occupy Syria. However, Demetrius Poliorcetes wins a battle over Ptolemy's forces and Antigonus enters Syria in force. So, after only a few months, Ptolemy evacuates his forces from Syria.
• In view of the threat by Seleucus to his control of the East, Antigonus decides to make peace with all of his adversaries, except Seleucus, who now holds Babylon. All of the diadochi confirm the existing boundaries and the freedom of the Greek cities. Ptolemy and Lysimachus are confirmed as satraps of Egypt and Thrace, respectively, and Antigonus and Cassander are confirmed as commanders of the army in Asia and Europe. Antigonus, no longer regent but now titled the strategos (officer in charge) of the whole of Asia, rules in Syria from the Hellespont to the Euphrates, including Asia Minor.
• It is agreed by all parties that the young king Alexander IV of Macedon, son of Alexander the Great, will become king of the whole empire when he comes of age in six years' time.
• The peace agreement between the diadochi is soon violated. On the pretext that garrisons have been placed in some of the free Greek cities by Antigonus. Ptolemy and Cassander renew hostilities against him.

Sicily

• The Carthaginian general Hamilcar crosses the Mediterranean with an army and wins the Battle of Himera against Agathocles, the tyrant of Syracuse.
• Hamilcar then proceeds with laying siege to Syracuse, where Agathocles had retreated.