Gyges had shared his father's preference for Greek art and artists.

Darius, who had formerly studied astronomy in Babylon, was one evening observing the heavens, when, to his surprise, he was addressed by the aged Neithotep and invited to follow him on to the temple-roof.

Darius, ever eager to acquire knowledge, did not wait to be asked twice, and was to be found there every night in earnest attention to the old priest's lessons.
On one occasion Psamtik met him thus with his master, and asked the latter what could have induced him to initiate a Persian in the Egyptian mysteries.
"I am only teaching him," answered the high-priest, "what is as well known to every learned Chaldee in Babylon as to ourselves, and am thereby gaining the friendship of a man, whose stars as far outshine those of Cambyses as the sun outshines the moon.

This Darius, I tell thee, will be a mighty ruler.

I have even seen the beams of his planet shining over Egypt.