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5,000 BCE - The sea still reaches the foot of the cliffs ofToompea
3,000 BCE - First signs of a settlement in Tallinn.
ca. 750 BCE - fortified settlement first built atIru near Tallinn, at thePirita 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-waterTallinn 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 nearAegna island, where aNovgorod fleet is defeated by a local fleet.
Ca. 1050 - Iru hillfort is abandoned for unknown reasons and Lindanise Fort is built onToompea hill. It will become the seat of the independentRevala County. Rus' chronicles refer to it as Kolyvan and it may be related to the giant-heroKalev in Estonian mythology, who is thought to be buried in Toompea, which is a tumulus on his grave.
1206 - 1stDanish attempt to conquerSaaremaa island, but it may have occurred in Lindanise in Revala instead and the opposing German chronicles may have altered the accounts.