Editing 280 BC (section)

==== Seleucid Empire ====
* [[Antiochus I Soter|Antiochus]] makes his eldest son, Seleucus, king in the east, but he proves to be incompetent.
* Antiochus is compelled to make peace with his father's murderer and King of Macedon, [[Ptolemy Keraunos]], abandoning, for the time being, his plans to control Macedonia and Thrace.
* [[Nicomedes I of Bithynia|Nicomedes]], King of [[Bithynia]], is threatened with an invasion from Antiochus who has already made war upon his father, [[Zipoites I of Bithynia|Zipoites]]. Antiochus actually invades Bithynia but withdraws again without risking a battle.
* Antiochus is unable to bring under his control the Persian dynasties that rule in [[Cappadocia]].
* Antiochus is defeated by [[Ancient Egypt|Egypt's]] [[Ptolemy II Philadelphus|Ptolemy II]] in the Damascene War.