and towards Europe via the area north of the Caspian. The region as a whole was called Ariana.
The ancient religion of Zoroastrianism is believed by some to have originated in what is now Afghanistan between 1800 and 800 BCE, as its founder Zoroaster is thought to have lived and died in Balkh. Ancient Eastern Iranian languages may have been spoken in the region around the time of the rise of Zoroastrianism. By the middle of the 6th century BCE, the Achaemenid Persians overthrew the Medes and incorporated Afghanistan (Arachosia, Aria and Bactria) within its boundaries. An inscription on the tombstone of King Darius I of Persia mentions the Kabul Valley in a list of the 29 countries that he had conquered.
Alexander the Great and his Macedonian army arrived to the area of Afghanistan in 330 BCE after defeating Darius III of Persia a year earlier in the Battle of Gaugamela. Following Alexander's brief occupation, the successor state of the Seleucid Empire controlled the area until 305 BCE when they gave much of it to the Indian Maurya Empire as part of an alliance treaty.
Alexander took these away from the Aryans and established settlements of his own, but Seleucus Nicator gave them to Sandrocottus (Chandragupta), upon terms of intermarriage and of receiving in exchange 500 elephants.
—Strabo, 64 BC – 24 AD
The Mauryans brought Buddhism from India and controlled the area south of the Hindu Kush until about 185 BCE when they were overthrown. Their decline began 60 years after Ashoka's rule ended, leading to the Hellenistic reconquest of the region by the Greco-Bactrians. Much of it soon broke away from the Greco-Bactrians and became part of the Indo-Greek Kingdom. The Indo-Greeks were defeated and expelled by the Indo-Scythians in the late 2nd century BCE.
During the 1st century BCE, the Parthian Empire subjugated the region, but lost it to their Indo-Parthian vassals. In the mid to late 1st century CE the vast Kushan
