This article concerns the period 809 BC – 800 BC.

• 804 BC—Adad-nirari III of Assyria led a campaign into Syria and Palestine, reaching Gaza.^[1]
• c. 800 BC—Greek Dark Ages end.
• c. 800 BC—Archaic period in Greece begins. (It ends in 480 BC with the invasion of Xerxes.)^{[citation needed]}
• From c. 800 BC – The Upanishads are composed.
• c. 800 BC–700 BC—Pre-Etruscan period in Italy.
• Etruscan civilization.
• The Olmecs build pyramids.^[2][3]

• 800 BC—End of the reign of Polydectes, king of Sparta from 830 BC.
• 800 BC—Beginning of the reign of Eunomus, king of Sparta until 780 BC.
• 800 BC—Emergence of the first communities settled in the Chincha Valley (Peru), pertaining to Paracas culture in the south coast of Peru.
• 800 BC—End of Period IVB, Hasanlu is completely destroyed by a fire.^[4]
• c. 800 BC—The Greek Colonization of the Mediterranean & Black Sea.^[5]
• c. 800 BC—Homer of Greece writes his Iliad and Odyssey. ( - 700 BCE)^[5]
• c. 800 BC—Assyrian army makes a use of the new technology by which iron can be hardened into steel suitable for weapons.^[6]
• c. 800 BC—Earliest surviving sundial is in use in Egypt.^[6]
• c. 800 BC—Beginning of Iron Age in Britain (until 43 AD).^[7]
• 800 BC—Heraion Teikhos Pharmaceutical Production Center was built.^{[citation needed]}

• 804 BC—Duke Wen of Qi, ruler of the state of Qi^[8][9]
• 804 BC—Pedubastis I, pharaoh
• 800 BC—Xiong Xun, monarch of the state of Chu during the Western Zhou dynasty of ancient China.
• c. 800 BC—Hasanlu Lovers, pair of human remains found at Teppe Hasanlu, possibly a couple.^[4]

• 
  Greek colonisation in the Archaic period.
• 
  Etruscan civilization map.
• 
  Western Zhou States Map.