227 BC

By place

Illyria

• Queen Teuta of Illyria finally surrenders to Roman forces and is forced by the Romans to accept an ignominious peace. The Romans allow her to continue her reign but restrict her to a narrow region around the Illyrian capital, Shkodra, :wikt:deprive|deprive her of all her other territory, and forbid her to sail an armed ship below Lissus just south of the capital. They also require her to pay an annual tribute and to acknowledge the final authority of Rome.

  Greece

• The Macedonian regent, Antigonus III, marries the former king Demetrius II's widow, Phthia, and assumes the crown thus deposing the young Philip V.
• The Spartan King Cleomenes III imposes reforms on his kingdom which include the cancelling of debts, providing land for 4,000 citizens, and restoring the training of youth in the martial arts. The Ephorate, five elected magistrates who, with the King, form the main executive body of the state, is abolished ; the powers of the Gerousia, the oligarchic council of elders, is curtailed; and the patronomoi is introduced. Cleomenes' changes are designed to make the monarchy supreme and re-create a society of aristocrats, while neglecting Sparta's helots and perioikoi. Eighty opponents of the reforms are exiled, while his brother Eucleidas is installed as co-ruler in the place of the murdered Archidamus V.
• Cleomenes III defeats the Achaeans under Aratus of Sicyon at Mount Lycaeum and at Ladoceia near Megalopolis.

  Roman Republic

• Sardinia and Corsica are made a combined province. Rome appoints, and in the future annually elects, two praetors for this province and for Sicily.
• Gaius Flaminius becomes Rome's first governor of Sicily.

  Seleucid Empire

• Antiochus Hierax tries to raise revolts against his brother Seleucus II in Syria and the east of the Seleucid kingdom. However, he is captured and exiled to Thrace, where he lives as a virtual prisoner.