Plutarch, Artaxerxes
Bernadotte Perrin, Ed.

2. Now Cyrus, from his very earliest years, was high-strung and impetuous, but Artaxerxes seemed gentler in everything and naturally milder in his impulses. His wife, a beautiful and excellent woman, he married in compliance with his parents' bidding, and kept her in defiance of them; for after the king had put her brother to death, he wished to kill her also. [2] But Arsicas, throwing himself at his mother's feet and supplicating her with many tears, at last obtained her promise that his wife should neither be killed nor separated from him. But the mother had more love for Cyrus, and wished that he should succeed to the throne. Therefore, when his father was now lying sick, Cyrus was summoned home from the sea-coast, and went up in full hope that by his mother's efforts he had been designated as successor to the kingdom. [3] For Parysatis had a specious argument (the same that Xerxes the Elder employed on the advice of Demaratus¹), to the effect that she had borne Arsicas to Dareius when he was in private station, but Cyrus when he was a king. However, she could not prevail, but the elder son was declared king, under the new name of Artaxerxes, while Cyrus remained satrap of Lydia and commander of the forces in the maritime provinces.²