In 1154, a town called  (''Qlwn'' or ''Quwri'') was put on the world map of the Almoravid (''Tabula Rogeriana'') 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 one possible transcription, 'Qlwn', may have denoted a predecessor of the modern city and may somehow be related to another name, 'Kolyvan', which has been discovered from later East Slavic chronicles. However, a number of modern historians have considered connecting any of al-Idrisi's placenames with modern Tallinn erroneous, unfounded or speculative.