20th century BC

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
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:

Inventions, Discoveries, Introductions:

1950 BC -- The copper bar cubit of Nippur defines the Sumerian cubit as 51.72 cm