Ancient Greek city states
Achaean Association
The Achaean Commonwealth was a federation of ancient Greek cities in the region of Achaia, located on the northern coast of the Peloponnesian peninsula.
The original Achaean Association was founded in the 5th century BC after the establishment of democratic changes and lasted until the second half of the 4th century BC, when it joined the opposition to the accession of Philip II. Philip of Macedon. Later, in 280 BC, the association was revived with the aim of expelling the Macedonians from the area. From then on, its influence became pan-Greek.
When the city of Sikyon was annexed in 251 BC, the whole association gained a great warlord, namely Aratus of Sikyon. This feat was the impetus for the annexation of other cities such as Corinth and Argos. The Achaean League grew stronger, but had conflicts with Sparta, which managed to win many cities to its side. Aratus had no choice but to ally himself with the Macedonians. In 222 BC the Battle of Sellasia took place, where Sparta succumbed to the enemy, but at the same time Macedonian rule over the Peloponnese was restored.