Anabasis

Now when Darius was dead, and Artaxerxes was established in the kingdom, Tissaphernes brought slanderous accusations against Cyrus before his brother, the king, of harbouring designs against him. And Artaxerxes, listening to the words of Tissaphernes, laid hands upon Cyrus, desiring to put him to death; but his mother made intercession for him, and sent him back again in safety to his province. He then, having so escaped through peril and dishonour, fell to considering, not only how he might avoid ever again being in his brother's power, but how, if possible, he might become king in his stead. Parysatis, his mother, was his first resource; for she had more love for Cyrus than for Artaxerxes upon his throne. Moreover Cyrus's behaviour towards all who came to him from the king's court was such that, when he sent them away again, they were better friends to himself than to the king his brother. Nor did he neglect the barbarians in his own service; but trained them, at once to be capable as warriors and devoted adherents of himself. Lastly, he began collecting his Hellenic armament, but with the utmost secrecy, so that he might take the king as far as might be at unawares.