What is 21st century BC?
{{Centurybox|-21}} The '''21st century BC''' is a [[century]] which lasted from the year 2100 BC to 2001 BC. == Events == [[Image:Khashkhamer seal moon worship.jpg|thumb|right|Ur-Nammu (seated) gives governorship to Ḫašḫamer]] <!-- Note that per WP:DATE, years before 1700 BC should link to the relevant century. Thus wikifying any of these years will redirect to this page. Only wikify links to other centuries. --> * 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 of Egypt|Ninth Dynasty]] wars in [[Egypt]]. * 2080 BC: [[First Intermediate Period of Egypt]] ended. [[Middle Kingdom of Egypt|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 – [[20th century 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, Egypt|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 [[Merikare|Merykare]] died. End of [[Tenth dynasty of Egypt]]. Pharaoh [[Mentuhotep II]] started to rule. Start of [[Eleventh dynasty of Egypt|Eleventh Dynasty]]. * 2034 BC – 2004 BC: [[Ur]]–[[Amorite]] wars. * c. 2009 BC – [[20th century BC|1997]] BC: Funerary temple of [[Mentuhotep III]] was built. [[Eleventh dynasty of Egypt|Eleventh Dynasty]]. * 2004 BC: [[Elamite Empire|