21st century BC

Millennium:	3rd millennium BC
Centuries:	22nd century BC · 21st century BC · 20th century BC
Decades:	2090s BC 2080s BC 2070s BC 2060s BC 2050s BC; 2040s BC 2030s BC 2020s BC 2010s BC 2000s BC
Categories:	Births – Deaths ; Establishments – Disestablishments

The 21st century BC is a century which lasted from the year 2100 BC to 2001 BC.

Events

Ur-Nammu (seated) gives governorship to Ḫašḫamer

c. 2100 BC – c. 2050 BC: Nanna Ziggurat, Ur (modern Muqaiyir, Iraq) was built.
2091 BC: Beginning of the Patriarchal Age was traditionally set in this year.
2080 BC: Ninth Dynasty wars in Egypt.
2080 BC: First Intermediate Period of Egypt ended. Middle Kingdom began in Ancient Egypt.
2071 BC: Magh Ithe, first recorded battle in Ireland myths.
2070 BC (disputable): Yu the Great set up the Xia Dynasty.
c. 2064 BC – 1986 BC: Twin Dynasty wars in Egypt.
c. 2055 BC: End of First Intermediate Period of Egypt.
c. 2055 BC: Middle Kingdom began in Ancient Egypt.
c. 2055 BC: Mentuhotep II from Thebes got Ancient Egypt together. He began to rule (other date is 2040 BC).
c. 2055 BC – 1985 BC: Funerary Stele of Amenemhat I was made. Eleventh Dynasty of Egypt. Excavated in 1915–1916. It is now kept in Egyptian Museum, Cairo. The Metropolitan Museum of Art, New York City.
c. 2049 BC: Oak trees for Seahenge felled.
2040 BC: Beginning of the Xia Dynasty, the first dynasty and government system in China.
2040 BC: Pharaoh Merykare died. End of Tenth dynasty of Egypt. Pharaoh Mentuhotep II started to rule. Start of Eleventh Dynasty.
2034 BC – 2004 BC: Ur–Amorite wars.
c. 2009 BC – 1997 BC: Funerary temple of Mentuhotep III was built. Eleventh Dynasty.
2004 BC: Elamite destruction of Ur.
c. 2004 BC: Pharaoh Mentuhotep II, Eleventh dynasty of Egypt dies.
c. 2000 BC: Aegean Bronze Age ended.

According to Abrahamic religious tradition, the era of the Patriarch Abraham (however, other dates include 19th century BC, and/or 17th century through 15th century BC)
According to Hindu tradition, lifetime of Rama, the 7th Avatar of Vishnu

2100 BC—Earliest law code in Mesopotamia, the Code of Ur-Nammu
2037 BC—Emperor Shen Nong makes first (perhaps mythical) tea drink by boiling fresh leaves

Ur-Nammu (seated) bestows governorship on Ḫašḫamer, patesi (high priest) of Iškun-Sin (cylinder seal impression, ca. 2100 BC).