5,000 BCE - The sea still reaches the foot of the cliffs of Toompea
3,000 BCE - First signs of a settlement in Tallinn.
ca. 750 BCE - fortified settlement first built at Iru near Tallinn, at the Pirita river bend. It is used until the 5th century BCE and then again during the 4th−2nd century BCE.
ca. 450 CE - Iru hillfort is built at th of the former fortified settlement.
9th century - Scandinavians (Varangians) start making trade voyages to East Slavs along the Gulf of Finland. During this period, the warm-water Tallinn Bay emerged as a vital trade harbor, laying the foundation for the city's significance as a trading hub in the region.
1032 - the naval battle at the "Iron Gate" possibly occurs near Aegna island, where a Novgorod fleet is defeated by a local fleet.
Ca. 1050 - Iru hillfort is abandoned for unknown reasons and Lindanise Fort is built on Toompea hill. It will become the seat of the independent Revala County. Rus' chronicles refer to it as Kolyvan and it may be related to the giant-hero Kalev in Estonian mythology, who is thought to be buried in Toompea, which is a tumulus on his grave.
1206 - 1st Danish attempt to conquer Saaremaa island, but it may have occurred in Lindanise in Revala instead and the opposing German chronicles may have altered the accounts.
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