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The1780s BC was a decade lasting from January 1, 1789 BC to December 31, 1780 BC.

• c. 1780 BC - The last known population ofwoolly mammoths onWrangel Island died out, possibly due to a combination of climate change and hunting.
• 1787-1784 BC: TheAmorite civilization conquersUruk andIsin.
• 1786 BC: In Egypt, theTwelfth Dynasty ends, and theThirteenth andFourteenth Dynasties begin.

• Rim-Sin I, ruler of the Middle Eastern city-state ofLarsa since 1822 BC, according to the middle chronology
• Sumu-la-El, king of Babylon from around 1817 to 1781 BC
• Nur-Adad, king of Larsa from 1801 to 1785 BC
• Hammurabi, king ofBabylon since 1792 BC, according to the middle chronology
• Yarim-Lim I, second king of the Amorite kingdom ofYamhad from c. 1780 to 1764 BC

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