454 BC

By place

Persian Empire

• Persian rule in Egypt is finally restored by Megabyzus, satrap of Syria, after a prolonged struggle which has included dealing with a military intervention by Athens. The leader of the revolt, Inaros, is crucified by the Persians.

  Greece

• Pericles leads a naval expedition in the Corinthian Gulf, in which Athens defeats Achaea. He then attacks Sicyon and Acarnania, after which he unsuccessfully tries to take Oeniadea on the Corinthian Gulf, before returning to Athens.
• Pericles declares that the Delian League's considerable treasury at Delos is not safe from the Persian navy and has the treasury transferred to Athens, thus strengthening Athens' power over the League.
• The treasury of the Delian League is moved from Delos to Athens.

  Roman Republic

• The Roman Plebs, suffering from a number of economic and financial ills, force the city’s patricians to begin the reform and codification of the law. As a first act, a three-man commission is sent to Athens to study that city's laws.

  Sicily

• Hostilities between Segesta and Selinunte, two Greek cities on Sicily, take place over access to the Tyrrhenian Sea.