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 Egypt
• circa 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