The Tomb of Cyrus (Persian: آرامگاه کوروش بزرگ) is the monument of Cyrus the Great approximately 1 km southwest of the palaces of Pasargadae. According to Greek sources, it dates back to 559–529 BC. The most extensive description based on a lost account by Aristobulus, who had accompanied Alexander the Great on his eastern campaign in the late 4th century BC, is to be found in the Anabasis of Arrian (6.29) written in the 2nd century AD.
Source: Tomb of Cyrus - Wikipedia