Achaemenid conquest of the Indus Valley in the context of "Achaemenid Empire"

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 monarchs of Iran ruled for over two and a half millennia, beginning as early as the 8th century BC and enduring until the 20th century AD. The earliest Iranian monarch is generally considered to have been either Deioces of the Median dynasty (c. 727–550 BC) or Cyrus the Great of the Achaemenid dynasty (550–330 BC). The last Iranian monarch was Mohammad Reza Pahlavi of the Pahlavi dynasty (1925–1979), who was overthrown in the Iranian Revolution. Since then, Iran has been governed by theocratic supreme leaders.

In classical antiquity, Iran reached the peak of its power and prestige under the Achaemenid Empire, which stretched from Egypt and parts of Southeast Europe in the west to the Indus Valley and parts of Central Asia in the east. By 323 BC, the Achaemenid Empire's territories had been conquered by the Macedonian Empire during the Wars of Alexander the Great, bringing Iran into the Hellenistic sphere. In the Wars of the Diadochi, the Seleucid Empire (305–129 BC) assumed control of Iran. Native Iranian rule was revived with the establishment and expansion of the Parthian Empire (247 BC–224 AD) and then the Sasanian Empire (224–651), which existed until the Arab conquest of Iran.

Hindush (Old Persian: 𐏃𐎡𐎯𐎢𐏁 Hidūš) was an administrative division of the Achaemenid Empire in modern-day Pakistan. According to the Greek historian Herodotus, it was the "easternmost province" governed by the Achaemenid dynasty. Established through the Persian conquest of the Indus Valley in the 6th century BCE, it is believed to have continued as a province for approximately two centuries, ending when it fell to the Macedonian Empire during the Indian campaign of Alexander the Great.
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