It now only remains to be told that Zopyrus, the son of Megabyzus, continued to the last the king's most faithful friend.
A courtier once showed the king a pomegranate, and asked him of what one gift of fortune he would like so many repetitions, as there were seeds in that fruit. Without a moment's hesitation Darius answered, "Of my Zopyrus."--[Plutarch] The following story will prove that Zopyrus, on his part, well understood how to return his royal friend's kindness. After the death of Cambyses, Babylon revolted from the Persian empire. Darius besieged the city nine months in vain, and was about to raise the siege, when one day Zopyrus appeared before him bleeding, and deprived of his ears and nose, and explained that he had mutilated himself thus in order to cheat the Babylonians, who knew him well, as he had formerly been on intimate terms with their daughters. He said he wished to tell the haughty citizens, that Darius had thus disfigured him, and that he had come to them for help in revenging himself. He thought they would then place troops at his disposal, with which he intended to impose upon them by making a few successful sallies at first. His ultimate intention was to get possession of the keys, and open the Semiramis gate to his friends.
These words, which were spoken in a joking tone, contrasted so sadly with the mutilated features of his once handsome friend, that Darius wept, and when at last the almost impregnable fortress was really won by Zopyrus' stratagem, he exclaimed: "I would give a hundred Babylons, if my Zopyrus had not thus mutilated himself."
He then appointed his friend lord of the giant city, gave him its entire revenues, and honored him every year with the rarest presents. In later days he used to say that, with the exception of Cyrus, who had no equal, no man had ever performed so generous a deed as Zopyrus.
[Herod. III. 160. Among other presents Zopyrus received a gold hand-mill weighing six talents, the most honorable and distinguished gift a Persian monarch could bestow upon a subject. According to Ktesias, Megabaezus received this gift from Xerxes.] Few rulers possessed so many self-sacrificing friends as Darius, because few understood so well how to be grateful.
When Syloson, the brother of the murdered Polykrates, came to Susa and reminded the king of his former services, Darius received him as a friend, placed ships and troops at his service, and helped him to recover Samos.
The Samians made a desperate resistance, and said, when at last they were obliged to yield: "Through Syloson we have much room in our land."