Xenophon 
Anabasis 

Of Darius and Parysatis were born two sons, the elder Artaxerxes, and the younger Cyrus. After Darius had fallen sick, and suspected that the end of his life was approaching, he was desirous that both of his sons should attend him. 2. The elder then happened to be present; Cyrus he sent for from the province of which he had made him satrap.