Achaemenid Arabia corresponded to the lands between Egypt and Mesopotamia, later known as Arabia Petraea. According to Herodotus, Cambyses did not subdue the Arabs when he attacked Egypt in 525 BCE. His successor Darius the Great does not mention the Arabs in the Behistun Inscription from the first years of his reign, but mentions them in later texts. This suggests that Darius conquered this part of Arabia.