312 BC

• The people of Cyrene in the Cyrenaica rise up in a revolt against Ptolemy, putting the Ptolemaic garrison, which occupies their citadel, under siege. After they execute Ptolemy's envoys, who came to bade them to cease their sedition, he sends Agis (one of his generals) with an army and Epaunetus (another general) with a fleet to put down the rebellion. Agis storms the city, captures the rebels, and sends the ringleaders to Alexandria.{{cite book|last=Siculus|first=Diodorus|title=Library|url=https://penelope.uchicago.edu/Thayer/E/Roman/Texts/Diodorus_Siculus/19E*.html#79|volume=XIX|chapter=79}}Diod. XIX 79,1–3

• After putting down the revolt in Cyrene, Ptolemy sails to Cyprus with a great force. He arrests the rulers of Kition, Lapethus, Kyrenia, and Marion for being too friendly towards Antigonus and/or too hostile towards himself, he then establishes his friend Nicocreon of Salamis as strategos (governor-general) of Cyprus .Diod. XIX 79,4–5

• Ptolemy raids Antigonus' territories in Cilicia and Syria, and then sails back to Egypt.Diod. XIX 79,6–7
• At the end of the year, Ptolemy invades Antigonus' territories in Palestine with an army of 18,000 infantry and 4,000 cavalry. The resulting Battle of Gaza leads to a triumph for Ptolemy over Antigonus' son, Demetrius.Diod. XIX 80–86
• Demetrius rallies the remnants of his army at Tripolis and summons reinforcements from the garrisons of upper Syria and Cilicia; he also writes his father, Antigonus, and urges him to send help. Meanwhile Ptolemy captures Acre, Joppa, Samaria and Sidon, and starts to besiege Tyre.Diod. XIX 84,4–86,1
• 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.{{cite book|last=Siculus|first=Diodorus|title=Library|url=https://penelope.uchicago.edu/Thayer/E/Roman/Texts/Diodorus_Siculus/19E*.html#86|volume=XIX|chapter=86}}

• At the start of the year, Asander (Antigonus' governor of Caria) rebels, forcing Antigonus (wintering with his main army in Phrygia) to invade Caria. Calling all his forces from their winter quarters, he divides them into four columns: the first is sent to take Miletus; the second, under his nephew Ptolemy, campaigns through central Caria from east to west; a third marches to and takes Theangela; Antigonus himself with the main army campaigns from north to south capturing Tralles, Iasus and Kaunos. Caria is taken in the space of weeks.Diod. XIX 64,3–6.
• Antigonus sends his nephew Telesphoros with an army of 5,000 infantry and 500 cavalry to mainland Greece to carry on the war against Cassander.Diod. XIX 64.

• The people of Epirus elevate Aeacides' brother, Alcetas, to the kingship.Diod. XIX 88, 89; Plut. Pyrr. 3.
• Alcetas advances on the Macedonian garrison of Acarnania under Lyciscus, a general of Cassander. Three battles are fought and a defeated Alcetas flees to a fortress in Epirus. Cassander marches the main Macedonian field army into Epirus and forces Alcetas to ally with him.Diod. XIX 88; Plut. Pyrr. 3.
• Cassander marches on Apollonia, which people had driven out his garrison with the help of the Illyrians, but the Appolonians and Illyrians defeat him in battle, driving him out of western Greece for the time being.
• The people of Epirus, tired of Alcetas (who ruled Epirus harshly), rose up and murdered him and his sons.
• Telesphorus arrives in to the Peloponnese and starts expelling Cassander's garrisons. He successfully liberates all cities and towns that are being held for Cassander by Polyperchon and his son Alexander; all except Sicyon and Corinth who are being defended by Polyperchon and Alexander themselves.Diod. XIX 64,1–2.
• Cassander sails against the city of Oreus on Euboea with a fleet of 30 ships. He blockades its port trying to force the city's surrender.
• Telesphorus comes to the aid of Oreus from the Peloponnese with 20 ships and 1,000 infantry, while Antigonid admiral Medius sails to relieve Oreus with a 100 ships from Asia Minor; they break Cassander's blockade.
• Cassander receives reinforcements from Athens (under Thymochares the Sphettian, descendant of Thymochares) and defeats Telesphoros' squadron.Diod. XIX 64,6–8
• Antigonus sends his nephew Ptolemy, whom he has made Strategos of Greece, with 5,000 infantry, 500 cavalry and 150 warships (he had recalled and reinforced Medius' fleet) to take command of all Antigonid forces and affairs in Greece.Diod. XIX 77,2–4
• Cassander abandons the siege of Oreus, concentrating his forces at Chalcis to counter Ptolemy who has landed at Bathys in Boeotia and has been reinforced by the Boeotian League with 2,200 infantry and 1,300 cavalry.Diod. XIX 77,4–5
• Antigonus marches his main field army to the Hellespontine region threatening to invade Europe and attack Macedon, forcing Cassander to retreat to Macedon to prepare its defences.Diod. XIX 77,4–6
• Antigonus arrives at the Propontis and tries to negotiate an alliance with Byzantium, but the city, at the urging of Lysimachus, remains neutral; without it Antigonus gives up on the idea of crossing over into Europe.Diod. XIX 77,6–7
• The Corcyraeans come to the aid of Apollonia and Epidamus and help the Apollonians and the people of Epidamus to remove the garrisons Cassander put there. They free Apollonia, but give the city of Epidamus to the Illyrian king Glaucias.Diod. XIX 78,1
• Ptolemy captures Chalcis, removes Cassander's garrison, but does not install a garrison of his own. Eretria and Carystus, both on Euboea as well, join Antigonus' alliance. Ptolemy crosses over to mainland Greece and captures Oropos, again removing Cassander's garrison, he then hands it over to Antigonus' ally, the Boeotian League. After Oropos he invades Attica putting pressure on Athens to negotiate a truce. From Attica he marches on Thebes, captures it and removes Cassander's garrison. He moves on to Phocis, drives out Cassander's garrisons in that region as well, and moves into Opuntian Locris, where he besieges Opus.Diod. XIX 78,2–5
• Telesphorus, who had been subordinated to Antigonus' other nephew Ptolemy considered this an insult and ends his friendship with Antigonus through betrayal.{{cite book|last=Siculus|first=Diodorus|title=Library|url=https://penelope.uchicago.edu/Thayer/E/Roman/Texts/Diodorus_Siculus/19E*.html#87|volume=XIX|chapter=87}}
• Telesphorus enters Elis, fortifies its citadel, and enslaves the city. He then marches on Olympia and plunders its sacred precinct collecting 500 talents; with his booty Telesphorus stars hiring mercenaries.
• Ptolemy soon restores the situation and persuades Telesphorus to give up his revolt.Diod. XIX 87,1–3

• Agathocles, tyrant of Syracuse, increased the size of his forces until they surpassed the Carthaginian garrison forces on the island.Diod. XIX 106,1
• Carthage, concerned with Agathocles' increasing powers, decided to send 130 warships and 14,200 soldiers under the command of a general named Hamilcar (son of Gisco, grandson of Hanno the Great).Diod. XIX 106,2
• Hamilcar's fleet was caught by several storms which sank 60 warships and destroyed 200 transports.Diod. XIX 106,3
• After landing on Sicily, Hamilcar gathered the remnants of his army, he also started to hire mercenaries, enlist those Sicilians opposed to Agathocles and enroll soldiers from the Carthaginian garrisons already on Sicily. In this way he was able to muster a large army.Diod. XIX 106,5
• Agathocles, fearing Gela would turn against him, took over the city, executed 4,000 leading Geloans he suspected of treason, and confiscated their property.Diod. XIX 107

• The Second Samnite War continues: there are rumours of a mobilisation of the Etruscans; since the consul Marcus Valerius Maximus Corvus is campaigning in Samnium and his consular colleague Publius Decius Mus is to ill to lead an army, the people appoint Gaius Sulpicius Longus as dictator. Sulpicius appoints Gaius Junius Bubulcus Brutus as his Magister Equitum (Second-in-command). Sulpicius ' mission is to defend against the Etruscan invasion which never materialize; Sulpicius and Brutus remain in camp at Rome until the end of the campaigning season.Livy VIII 9.29
• 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.

• Peithon (son of Agenor)

• Diodorus Siculus, Bibliotheca Historica, volume XIX.
• Livy, Ab Urbe Condita (History of Rome), volume VIII.

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