**Cyrus II, known as Cyrus the Great** (c. 600–530 BCE), is the revered founder of the **Achaemenid Empire**. He successfully united the Persians, defeated the powerful Median kingdom, and expanded the empire to include Lydia and Babylon. He is also famous for his humane treatment of conquered peoples, including allowing the Jewish exiles to return to Jerusalem.

The **Battle of Marathon** was a pivotal moment during the first **Persian** invasion of Greece. A smaller Athenian force, aided by the Plataeans, decisively defeated the much larger Persian army under Darius I. This victory demonstrated the potential of Greek hoplite warfare and temporarily halted Persian expansion into Europe.

The **Delian League** was founded in 478 BCE and named for the island of Delos, where its treasury was initially kept. It was overwhelmingly dominated and controlled by **Athens**. Over time, Athens used the league's resources for its own political and imperial ends, ultimately leading to the Peloponnesian War against Sparta and its allies.

The **Battle of Marathon** was a pivotal event in the Greco-Persian Wars, fought between the citizens of **Athens** (supported by Plataea) and a Persian force sent by Darius I. The battle occurred on the plain of Marathon, about 42 kilometers northeast of Athens.

**Cyrus II** (known as **Cyrus the Great**) founded the **Achaemenid Empire** (First Persian Empire) around 550 BCE. He is renowned for his military successes, the liberation of the Jewish exiles from Babylon, and his famously humane policy towards conquered peoples, as recorded in the Cyrus Cylinder.

The **Hellenistic Age** began in 323 BCE with the death of **Alexander the Great** and ended with the Roman conquest of the last Hellenistic kingdom (Ptolemaic Egypt) in 30 BCE. It is characterized by the spread of Greek culture, language, and influence across the former Persian Empire.

The **Delian League** was founded in 478 BCE, with its treasury on the island of Delos, primarily to unite Greek city-states under the leadership of **Athens** for the purpose of continuing the war against the **Persian Empire** and liberating Greek cities still under Persian control.

The **Battle of Thermopylae** was fought between an alliance of Greek city-states and the Persian Empire of **Xerxes I**. Despite the Greek defeat, the stand made by **King Leonidas** and his 300 Spartans became a legendary symbol of bravery and defiance.

**Herodotus** (c. 484–425 BCE) was a Greek writer and geographer. His work, *The Histories*, is a detailed account of the origins and execution of the Greco-Persian Wars. Cicero famously dubbed him the **'Father of History'** because he was the first to systematically investigate historical events.

While the modern Suez Canal was built in the 19th century, ancient canals were constructed in the same region. The first canal connecting the Nile and the Red Sea was initiated by Pharaoh **Necho II** (c. 600 BCE) and later completed and maintained by the Persian King **Darius I**.