Those, therefore, who were possessed of power along with him, stimulated by envy, because a foreigner belonging to a captive nation had been placed on a footing of equality with them, constrain the king, who had been corrupted by flattery, to enact that divine honors should be paid to him for the next thirty days, and that it should not be lawful for any one to pray to a god except the king. Darius was easily persuaded to that, through the folly of all kings who claim for themselves divine honors.
In these circumstances, Daniel being not unacquainted with what had happened, and not being ignorant that prayer ought to be addressed to God, and not to man, is accused of not having obeyed the king's commandment. And much against the will of Darius, to whom he had always been dear and acceptable, the rulers prevailed that he should be let down into a den. But no harm came to him when thus exposed to the wild beasts. And on the king discovering this, he ordered his accusers to be given over to the lions.
They, however, did not pass through a similar experience, for they were instantly devoured to satisfy the hunger of the savage beasts. Daniel, who had been famous before, was now esteemed still more famous; and the king, repealing his former edict, issued a new one to the effect that, all errors and superstitions being abandoned, the God of Daniel was to be worshipped. There exists also a record of visions of Daniel, in which he revealed the order of events in coming ages, embracing in them also the number of the years, within which he announced that Christ would descend to earth (as has taken place), and clearly set forth the future coming of Antichrist.
If any one is eager to inquire into these points, he will find them more fully treated of in the book of Daniel: our design is simply to present a connected statement of events. Darius is related to have reigned eighteen years; after which date Astyages began to rule over the Medes.
Source: Sacred History (New Advent)