Sikyonia

480 BCE
August 7

The Greek allies are forced to withdraw against the Persians in the Battle of Artemisium. Afterwards the Persians occup Histaia. The Greek fleet is supplied by Athens, Chalkis, Sparta, Troizen, Opuntian Lokris, Corinth, Megara, Epidauros, Aegina, Sikyon, and Kios.

394 BCE
July

Sparta and their allies defeat Athens and their allies at the Battle of Nemea. On Athens side are Thebes, Lokris Opuntii, and Corinth. With Sparta are Halieis, Sikyon, Epidauros, Troizen, and Hermione. Phlious remains neutral.

362 BCE
July 4

Epaminondas and Boeotia defeat Sparta at the Battle of Mantinea. However, the death of Epaminondas would spell Thebes‘ downfall. On the side of Thebes were Tegea, Argos, Messene, Sikyon, and the Aenianians. On the side of Sparta were Heraia, Athens, Elis, and Mantinea.

300 BCE

Antigonos II installs the tyrant Kleon at Sikyon.

264 BCE

Antigonos II installs the tyrant Abantidas at Sikyon.

252 BCE

Antigonos II installs the tyrant Paseas at Sikyon.

251 BCE

The tyrant Iseas of Aegira is overthrown by Aratus of Sikyon, a key leader of the Achaean League, who frees the city from local tyranny.

251 BCE

Antigonos II installs the tyrant Nikokles at Sikyon.

251 BCE

Aratos of Sikyon removes the tyrant Nikokles, who Antigonos II had installed. Antigonos II attempts to bribe Aratos but is unsuccessful.

243 BCE

Aratos of Sikyon takes Acrocorinth. The inhabitants of Corinth rise up against Antigonos II.

228 BCE

Aratos of Sikyon takes the Acrocorinth and frees Argos. Xenon steps down in Hermione.

226 BCE

The Spartans under King Kleomenes III defeat the Achaian League under Aratos of Sikyon (and including Argos and Megalopolis) in the Battle of Dyme.

220 BCE

The Social War begins, pitting members of the Achaian League, including Aegira, Patrai, Dyme, Bura, Sikyon, Corinth, Megalopolis, Messenia, Argos, Elis, and Macedon, against Sparta under King Kleomenes III, who were supported by the Aetolian League and Athens.

200 BCE-
197 BCE

During the Second Macedonian War between Rome and Philip V of Macedon, Aegira, the Aetolian League, Corinth, Sikyon, Patrai, Athens, Pergamon, and Rhodes support Rome.

146 BCE

The Achaian League is defeated by Rome. Corinth is destroyed and Dyme, Patrai, Sikyon, Bura, and Aegira come under the control of Rome.