The helots' revolt, suppressed by Sparta with difficulty, lasts for ten (or possibly only four) years.

Messenian resistance, which had begun to flag in 457, ends in 455 with the fall of Mount Ithome.

The surviving Messenians, freed by the Spartans but exiled from the Peloponnesus, join Athens in their ongoing larger conflict with Sparta.

Persian military engineers change the course of the Nile in 454 BCE to finally crush the defending Egyptian rebels and their Greek allies.

Inaros, after fighting for a year and a half in the marshes, is defeated by Megabyzus and taken captive, together with the Greeks, away to Susa.

Pericles launches a naval expedition in the Corinthian Gulf in 454 BCE, in which Athens defeats Achaea, seizing a long coastal strip, but fails to win more important objectives.

The Athenians, having received the vassalage of Sparta's restive helots, order them to colonize the Gulf region.

Pitsunda, today a resort town in the Gagra district of modern Abkhazia, the breakaway republic of Georgia, situated on the shore of the Black Sea twenty-five kilometers south from Gagra, is founded by the Greeks in the fifth century BCE as a trade colony called Pityus or Pitiunt.

The Celtic migration of the mid-fifth century (commonly known as the La Tene phase of Celtic culture) marks the transition from the Early to the Late Iron Age in Europe.

Etruscans had begun widely exporting to the north a type of bronze pitcher, the so-called “Schnabelkanne," or beaked pitcher, around the beginning of the fifth century.

The Celts of the La Tene culture have begun to copy these and develop their own sense of style, usually making them in bronze or clay.

The most famous Celtic beaked pitchers come from the Hessian Glauberg and the Dürrnberg in Hallein in Austria, which are considered Celtic developments.

The Middle East: 453–442 BCE

The Peace of Callias and Persian Consolidation

In 449 BCE, Artaxerxes I concludes an agreement known as the Peace of Callias, named after the Athenian ambassador and Marathon veteran, Callias, who purportedly negotiates this accord. Although the historicity of a formal treaty remains debated, the arrangement effectively recognizes Athenian control and influence over the city-states of the Greek mainland and the islands of the Aegean Sea.

This peace marks a significant diplomatic moment, indicating Persian willingness to acknowledge, at least implicitly, a limit to its westward expansion. Artaxerxes's focus shifts inward, consolidating authority within existing imperial boundaries and continuing to address regional stability. The Persian Empire, though politically intact and still extensive, must manage ongoing tensions and administrative challenges in its far-flung satrapies, while recognizing practical limits to its imperial ambitions.

Mediterranean naval architects in the mid fifth century BCE, increase a ship's carrying capacity by building up its bulwarks.

Some ships by this time step two masts, with a sail hoisted on each.

These broad-beamed trading vessels are known as "round ships."

The Greeks increase their size.

Artaxerxes apparently concludes a peace treaty in 449 BCE with Athens, supposedly negotiated by Marathon veteran and ambassador Callias, and therefore called the “Peace of Callias.”

Treaty or no treaty, the Persians do, in fact, recognize the Athenian sphere of influence at this time.

Prakrit, which develops from Classical Sanskrit about 450 BCE, is the first of the so-called Middle Indic languages.

Near East (453–442 BCE): Yehud's Revival, Leadership of Ezra and Nehemiah, and Ephesian Subjugation

Between 453 and 442 BCE, the Near East witnesses significant cultural and political developments, especially in the province of Yehud—the Aramaic name for the former Kingdom of Judah under Persian rule. During this era, the Judahite community, known increasingly as Yehudim or Jews, faces daunting challenges. Although the Temple in Jerusalem has been rebuilt, the Jewish inhabitants remain dispirited and vulnerable, confronting persistent threats from neighboring communities.

Into this period of uncertainty step influential leaders returning from exile. Most prominent among them is Nehemiah, an important official serving as cupbearer to the Persian king Artaxerxes I. Deeply troubled by reports of Jerusalem's desolation, Nehemiah obtains royal permission around 445 BCE to return and rebuild the city’s infrastructure. With Persian support, including official documents and an armed escort, Nehemiah galvanizes the local population, successfully reconstructing Jerusalem’s walls within fifty-two days despite regional hostility.

Accompanying these political developments are substantial religious reforms spearheaded by the learned priest Ezra, whose arrival in Jerusalem is traditionally placed in 458 BCE, though alternative chronologies suggest 428 BCE or even 398 BCE under the reign of Artaxerxes II. Ezra's mission emphasizes rigorous adherence to the Torah and imposes stringent measures against intermarriage with non-Jews, thereby strengthening religious identity and communal solidarity. A public ceremony of allegiance to the Torah further consolidates spiritual life and identity, effectively transforming Judahite society into the distinctly Jewish community known historically.

Concurrently, the city of Ephesus in southwestern Anatolia comes under the economic and political dominance of Athens after 454 BCE, regularly contributing tribute to the Athenian treasury. This shift reflects the broader dynamics of Greek influence and control extending into the coastal regions of Anatolia.

Thus, the Near East during this period is characterized by a profound transformation within Yehud, driven by powerful religious and political leadership, alongside shifting power relations and increased Greek influence in Anatolia.