What faith did king Cyrus the great follow?

According to the Bible, Cyrus the Great, king of Persia, was the monarch under whom the Babylonian captivity ended. In the first year of his reign he was prompted by God to decree that the Temple in Jerusalem should be rebuilt and that such Jews as cared to might return to their land for this purpose. Moreover, he showed his interest in the project by sending back with them the sacred vessels which had been taken from the First Temple and a considerable sum of money with which to buy building materials. The existence of the decree has been challenged. It is monotheistic

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