The city was known as Reval from the 13th century until 1918 and again during the Nazi occupation of Estonia from 1941 to 1944.
Approximately 32% of Estonia's total population lives in Tallinn.
In 1154, a town called Qlwn or Qalaven (possible derivations of Kalevan or Kolyvan) was put on the world map of the Almoravid by the Arab cartographer Muhammad al-Idrisi, who described it as a small town like a large castle among the towns of Astlanda. It has been suggested that the Quwri in Astlanda may have denoted the predecessor town of today's Tallinn.
2019, Tallinn, Estonia – Bitcasino.io, the pioneering online Bitcoin casino, has pledged a massive 101,010 trees (at $1 per tree) to the ever-growing viral #teamtrees movement, which gained traction after pledging to plant 20 million trees by the beginning of 2020.