20th century BC
(21st century BC - 20th century BC - 19th century BC - other centuries) (3rd millennium BC - 2nd millennium BC - 1st millennium BC)
---- Events 2064 - 1986 BC -- Twin Dynasty wars in Egyptcirca 2000 BC -- Abraham, a significant patriarchal figure in Judaism, Christianity, and Islam, is born. 2000 BC -- Farmers and herders travel south from Ethiopia and settle in Kenya. 1991 BC -- Egypt: End of Eleventh Dynasty, start of Twelfth Dynasty 1932 BC -- Amorite conquest of Ur 1913 - 1903 BC -- Egyptian-Nubian war 1900 BC -- Achaean invasions of Greece around 1900 BC -- Fall of last Sumerian dynasty
Significant persons Abraham, significant figure in Judaism, Christianity, and Islam
Inventions, discoveries, introductions 1950 BC -- The copper bar cubit of Nippur defines the Sumerian cubit as 51.72 cm
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