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

Events and trends 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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