21st century BC

Events

• c. 2100–2050 BC — Nanna Ziggurat, Ur (modern Muqaiyir, Iraq) is built.
• 2091 BC — Beginning of the mythological Patriarchal Age is traditionally set in this year.
• 2080 BC — Ninth Dynasty wars in Egypt.
• 2080 BC — First Intermediate Period of Egypt ends. Middle Kingdom starts in Ancient Egypt.
• 2071 BC — Magh Ithe, first recorded battle in Ireland myths.
• 2070 BC (disputable) — Yu the Great set up the Xia Dynasty, which isn't verified by archeological findings, some propose the Erlitou culture.
• 2064–1986 BC — Twin Dynasty wars in Egypt.
• c. 2055 BC — End of First Intermediate Period of Egypt (another date is 2040 BC).
• c. 2055 BC — Middle Kingdom starts in Ancient Egypt (other date is 2040 BC).
• c. 2055 BC — Prince Mentuhotep II from Thebes manages to reunite Ancient Egypt (other date is 2040 BC).
• c. 2055 BC — Pharaoh Mentuhotep II starts to rule in Ancient Egypt
• 2049 BC — Oak trees for Seahenge felled.
• c. 2040 BC — End of First Intermediate Period of Egypt. Start of Middle Kingdom. 11th–14th Dynasties.
• 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.
• 2034–2004 BC — Ur-Amorite wars.
• c. 2009–1997 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.

Significant persons

• Ur-Nammu, 3rd dynasty of Ur
• Shulgi of Urim
• Abraham (perhaps, other datings include 19th century BC, 17th century BC, 16th Century BC, and 15th Century BC)
• According to Hindu tradition, lifetime of Rama, the 7th avatar of Vishnu

Births

• Salah, son of Arpachshad, (2067–1634 BC) according to the Hebrew Calendar
• Eber, son of Shelah, (2037–1573 BC) according to the Hebrew Calendar
• Peleg, son of Eber, (2003–1764 BC) according to the Hebrew Calendar

Inventions, discoveries, introductions

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

Decades and years