History of Persian Egypt in the context of North Africa during classical antiquity

The history of North Africa during the period of classical antiquity (c. 8th century BCE – 5th century CE) can be divided roughly into the history of Egypt in the east, the history of ancient Libya in the middle and the history of Numidia and Mauretania in the west.

Initially, in the east, Egypt was under Persian rule during the early phase of classical antiquity, passing to the Ptolemaic dynasty in the Hellenistic era. Libya was inhabited by Berber tribes, while along the coast Phoenician and Greek colonies were set up.

Ancient Egypt was a cradle of civilization concentrated along the lower reaches of the Nile River in Northeast Africa. It emerged from prehistoric Egypt around 3150 BC (according to conventional Egyptian chronology), when Upper and Lower Egypt were amalgamated by Menes, who is believed by the majority of Egyptologists to have been the same person as Narmer. The history of ancient Egypt unfolded as a series of stable kingdoms interspersed by the "Intermediate Periods" of relative instability. These stable kingdoms existed in one of three periods: the Old Kingdom of the Early Bronze Age; the Middle Kingdom of the Middle Bronze Age; or the New Kingdom of the Late Bronze Age.

The pinnacle of ancient Egyptian power was achieved during the New Kingdom, which extended its rule to much of Nubia and a considerable portion of the Levant. After this period, Egypt entered an era of slow decline. Over the course of its history, it was invaded or conquered by a number of foreign civilizations, including the Hyksos, the Kushites, the Assyrians, the Persians, and the Greeks and then the Romans. The end of ancient Egypt is variously defined as occurring with the end of the Late Period during the Wars of Alexander the Great in 332 BC or with the end of the Greek-ruled Ptolemaic Kingdom during the Roman conquest of Egypt in 30 BC. In AD 642, the Arab conquest of Egypt brought an end to the region's millennium-long Greco-Roman period.

Darius I (Old Persian: 𐎭𐎠𐎼𐎹𐎺𐎢𐏁 Dārayavaʰuš; c. 550 – 486 BCE), commonly known as Darius the Great, was the third King of Kings of the Achaemenid Empire, reigning from 522 BCE until his death in 486 BCE. He ruled the empire at its territorial peak, when it included much of West Asia, parts of the Balkans (Thrace–Macedonia and Paeonia) and the Caucasus, most of the Black Sea's coastal regions, Central Asia, the Indus Valley in the far east, and portions of North Africa and Northeast Africa including Egypt (Mudrâya), eastern Libya, and coastal Sudan.

Darius ascended the throne after overthrowing the Achaemenid monarch Bardiya (or Smerdis), who he claimed was in fact an imposter named Gaumata. The new king met with rebellions throughout the empire but quelled each of them; a major event of Darius's career described in Greek historiography was his punitive expedition against Athens and Eretria for their participation in the Ionian Revolt.

The Twenty-sixth Dynasty of Egypt (notated Dynasty XXVI, alternatively 26th Dynasty or Dynasty 26) was the last native dynasty of ancient Egypt before the Persian conquest in 525 BC (although other brief periods of rule by Egyptians followed). The dynasty's reign (664–525 BC) is also called the Saite Period after the city of Sais, where its pharaohs had their capital, and marks the beginning of the Late Period of ancient Egypt.