The 1120s BC is a decade that lasted from 1129 BC to 1120 BC.

  • 1127/6 BC—Thymoetes, legendary King of Athens, dies after a reign of 9 years. He is succeeded by his designated heir Melanthus of Pylos, son of Andropompus, who had reportedly assisted him in battle against the Boeotians.
  • 1122 BC—Legendary founding of Pyongyang
  • 1122 BC—Legendary founding emigration of Gija to Gija Joseon.
  • c. 1120 BC—Destruction of Troy VIIb1.

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