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Nebuchadnezzar II 
of Babylon
Nebuchadnezzar II (nɛbjʉkədˈnɛzər/; Aramaic: ܢܵܒܘܼ ܟܘܼܕܘܼܪܝܼ ܐܘܼܨܘܼܪ ‎; Hebrew: נְבוּכַדְנֶצַּר Nəḇūḵaḏneṣṣar; Ancient Greek: Ναβουχοδονόσωρ Naboukhodonósôr; Arabic: نِبُوخَذنِصَّر nibūḫaḏniṣṣar; c 634 – 562 BC) was king of the Neo-Babylonian Empire, who reigned c. 605 BC – 562 BC. He is credited with the construction of the Hanging Gardens of Babylon and for the destruction of the First Temple. He is featured in the Book of Daniel and is mentioned in several other books of the Bible.  
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Belshazzar of Babylon
Belshazzar (/bɛlˈʃæzər/; Biblical Hebrew בלשאצר; Akkadian: Bēl-šarra-uṣur) "Bel, protect the king", sometimes called Balthazar /ˈbælθəˌzɑr/, was a 6th-century BC prince of Babylon, the son of Nabonidus and the last king of Babylon according to the Book of Daniel in the Hebrew Bible. In Daniel 5 and 8, Belshazzar is the King of Babylon before the advent of the Medes and Persians. Read more here.
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Darius I (The Great) of Persia
Darius I (Old Persian: Dārayava(h)uš; New Persian: داریوش بزرگ c. 550–486 BCE) was the third king of the Persian Achaemenid Empire. Also called Darius the Great, he ruled the empire at its peak.
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Cyrus the Great of Persia
Cyrus the Great figures in the Hebrew Bible as the patron and deliverer of the Jews. He is mentioned 23 times by name and alluded to several times more. From these statements it appears that Cyrus the Great, king of Persia, was the monarch under whom the Babylonian captivity ended.

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