Question

During Alexander the Great’s reign, Darius III was the king of

Answer 1

Darius III was the last king of the Achaemenid Empire of Persia from 336 BCE to 330 BCE.

Answer 2

During Alexander the Great’s reign, Darius III was the king of Persia.

Step-by-step explanation:

"Darius III, also called Codommanus, (died 330 BC, Bactria), the last king (reigned 336–330 BC) of the Achaemenid dynasty. [...]

In 337 Philip II of Macedon had formed the League of Corinth for the purpose of liberating the Greek cities under Achaemenid rule and, early in 336, had sent an advance force into Asia Minor. In July, however, he was assassinated, perhaps at the instigation of Darius. In the spring of 334 Philip’s son Alexander the Great crossed the Hellespont."

Reference: Britannica, The Editors of Encyclopaedia. “Darius III.” Encyclopædia Britannica, Encyclopædia Britannica, Inc., 2019