Vassal states were common among the empires of the Near East, dating back to the era of the Egyptian, Hittite and Mitanni conflict, as well as ancient China.
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The use of vassal states continued through the Middle Ages, with the last empire to use such states being the Ottoman Empire.
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Egypt's key vassal states were located on the northern frontier, and included states such as Nuhasse, Qatna and Ugarit.
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However, these vassal states were claimed by the Hittite Empire following the death of Akhenaten and were never reclaimed.
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Hittite Empire incorporated vassal states that extended over much of Anatolia and Northern Syria.
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The addition of vassal states reached its peak under the reigns of Suppiluliuma I and Mursili II in the 14th Century BC.
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The relationships between the Hittites and their vassal states centered around the Hittite king and the vassal ruler; the terms of their relationship were imposed unilaterally by the former, and accepted by the latter.
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Treaties imposed on vassal states came with military obligations, though vassals were promised military assistance in return.
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Vassal states were obliged to support and swear fealty to the king's legitimate successors as well.
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One of these vassal states would go on to conquer China and unite the country under the first emperor Qin Shi Huang.
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