21st century BC

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

Events

Note: all dates from this long ago should be regarded as either approximate or conjectural; there are no absolutely certain dates, and multiple competing reconstructed chronologies, for this time period.

  • 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, which isn't verified by archeological findings, some propose the Erlitou culture.
  • c. 2064 BC – 1986 BC: Twin Dynasty wars in Egypt.
  • c. 2055 BC: End of First Intermediate Period of Egypt. Start of Middle Kingdom. (another date is 2040 BC).
  • c. 2055 BC: Mentuhotep II from Thebes managed to reunite Ancient Egypt and began to rule (other date is 2040 BC).
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