In 1154, a town called ("Qlwn" or "Qalaven", possibly 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 was suggested that Quwri may have denoted a predecessor of the modern city. Another possibly one of the earliest name of Tallinn is "Kolyvan" (), which has been discovered from East Slavic chronicles and may somehow be connected to the Estonian mythical hero Kalev. However, a number of modern historians have considered connecting al-Idrisi placename(s) with Tallinn unfounded and erroneous.