View source for 282 BC

=== By place ===
==== Asia Minor ====
* The city of [[Pergamum]] in [[Asia Minor]] ends its allegiance to [[Lysimachus]]. Its ruler, [[Philetaerus]], transfers his allegiance, as well as the important fortress of Pergamon and his treasury, to [[Seleucus I Nicator|Seleucus]], who allows him a far larger measure of independence than he had hitherto enjoyed.

==== Roman Republic ====
* The [[Battle of Populonia]] is fought between [[Roman Republic|Rome]] and the [[Etruscans]]. The Romans are victorious and, as a result, the Etruscan threat to Rome is sharply diminished.
* The [[Magna Graecia]] city of [[Thurii]] appeals to Rome for help against the native Italian tribes. Though the [[Roman Senate]] hesitates, the plebeian Assembly decides to respond. Thurii is saved, but [[Taranto|Tarentum]], jealous of Rome's interference, attacks and sinks some Roman ships entering its harbour. Roman envoys, sent to protest, are mistreated.
* Rome declares war on Tarentum. King [[Pyrrhus of Epirus]] declares his willingness to come to the aid of Tarentum. Tarentum also looks for support from the [[Samnites]] and other Italian tribes in southern [[Italy]].

==== Egypt ====
* [[Arsinoe I of Egypt|Arsinoe]], daughter of [[Lysimachus]], king of [[Thrace]], marries [[Ptolemy II Philadelphus|Ptolemy II]] of [[Ancient Egypt|Egypt]] as part of the alliance between Thrace and Egypt against Seleucus.