The Book of Daniel (דניאל), originally written in Hebrew an Aramaic, is a book in both the Hebrew Bible (Tanakh) and the Christian Old Testament. The book is set during the Babylonian Captivity, a period when Jews were deported and exiled to Babylon. The book revolves around the figure of Daniel, an Israelite who becomes an adviser to Nebuchadnezzar, the ruler of Babylon from 605 BC - 562 BC.