2 Chronicles 36:20

Where they were servants to him and his sons They do not seem to have been made captives to private persons, but to have been taken in one body, and made the servants of the king; that is, to have been employed by him, in one way or other, to his private advantage, which we are not now acquainted with. Until the reign of the kingdom of Persia Until the reign of the king of Persia, Houb. Respecting the proclamation of Cyrus, see the beginning of the next book. From these words, we may conclude that this book was written after the return from captivity.