197 BC

By place

Asia Minor

• Eumenes II becomes King of Pergamum following the death of his father Attalus I Soter.
• Antiochus III occupies parts of the kingdom of Pergamum and a number of Greek cities in Anatolia.

  Egypt

• The Egyptian King, Ptolemy V, fights rebels in the Nile Delta, exhibiting great cruelty toward those of their leaders who capitulate.

  Greece

• The Spartan ruler, Nabis, acquires the important city of Argos from Philip V of Macedon, as the price of his alliance with the Macedonians. Nabis then defects to the Romans in the expectation of being able to hold on to his conquest.
• The Battle of Cynoscephalae in Thessaly gives a Roman army under pro-consul Titus Quinctius Flamininus a decisive victory over Philip V of Macedon. In the Treaty of Tempe, the terms of the peace proposed by the Roman general and adopted by the Roman Senate specify that Philip V can retain his throne and control of Macedonia, but he has to abandon all the Greek cities he has conquered. Philip also has to provide to the Romans 1,000 talents as indemnity, surrender most of his fleet and provide hostages, including his younger son, Demetrius, who is to be held in Rome. The Aetolians propose that Philip V be ejected from his throne but Flamininus opposes this.
• The volcanic island of Hiera emerges from under the sea near Thera.

  Hispania

• Hispania is divided into Hispania Ulterior and Hispania Citerior.