Table medal "Tallinn 1154" Middle of 20th century. Estonia, silver-plated bronze. Weight - 86.13 g, diameter 5.6 cm
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.