Which king conquered Babylon as he built the Persian Empire?
Cyrus the Great.
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'Thus saith Cyrus, king of Persia: All the kingdoms of the earth
hath Yahweh, the God of heaven, given me; and He hath charged me to
build Him a house in Jerusalem, which is in Judah. Whosoever there
is among you of all His people may Yahweh, his God, be with him and
let him go there.' (2 Chronicles 36:23)