Gandāra in the context of India (Herodotus)

Around 535 BCE, the Persian king Cyrus the Great initiated a protracted campaign to absorb parts of India into his nascent Achaemenid Empire. In this initial incursion, the Persian army annexed a large region to the west of the Indus River, consolidating the early eastern borders of their new realm. With a brief pause after Cyrus' death around 530 BCE, the campaign continued under Darius the Great, who began to re-conquer former provinces and further expand the Achaemenid Empire's political boundaries. Around 518 BCE, the Persian army pushed further into India to initiate a second period of conquest by annexing regions up to the Jhelum River in what is today known as Punjab. At peak, the Persians managed to take control of most of modern-day Pakistan and incorporate it into their territory.

The first secure epigraphic evidence through the Behistun Inscription gives a date before or around 518 BCE. Persian penetration into the Indian subcontinent occurred in multiple stages, beginning from the northern parts of the Indus River and moving southward. As mentioned in several Achaemenid-era inscriptions, the Indus Valley was formally incorporated into the Persian realm through provincial divisions: Gandāra, Hindush, and Sattagydia.

Sattagydia or Thatagush (Old Persian: 𐎰𐎫𐎦𐎢𐏁 Thataguš, country of the "hundred cows") was one of the easternmost regions of the Achaemenid Empire, part of its Seventh tax district according to Herodotus, along with Gandārae, Dadicae and Aparytae. It was situated east of the Sulaiman Mountains up to the Indus in the Kurram River basin around Bannu in modern day's southern Khyber Pakhtunkhwa, Pakistan. Sattagydia was no longer mentioned by the third century BC, probably having been absorbed into one of the adjoining provinces.

Paropamisadae or Parapamisadae (Ancient Greek: Παροπαμισάδαι or Παροπανισάδαι) was a satrapy of the Alexandrian Empire in modern Pakistan, which largely coincided with the Achaemenid province of Parupraesanna. It consisted of the districts of Sattagydia (Bannu basin), Gandhara (Kabul, Peshawar, and Taxila), and Oddiyana (Swat Valley). Paruparaesanna is mentioned in the Akkadian language and Elamite language versions of the Behistun Inscription of Darius the Great, whereas in the Old Persian version it is called Gandāra. The entire satrapy was subsequently ceded by Seleucus I Nicator to Chandragupta Maurya after Mauryan Victory in Selucid-Mauryan war following a treaty.