the snake begged for peace and pleaded with Allah to give her wings. Once she had her wings the snake flew away from Bilär. Another great snake was said to live in a pagan tower temple at Alabuğa. Although the Bulgars adopted Islam as early as the 10th century, the snake survived until the time of Tamerlane's invasion after which it disappeared. Ibn Fadlan, who visited Volga Bulgaria in the 10th century, referred to numerous snakes, especially in trees. Ibn Fadlan wrote about a huge fallen tree, longer than hundred ells. He saw a big snake at the trunk of the tree, almost as large as the tree itself. The Bulgars allayed his fears by assuring him that the snake was not dangerous. Interpretations The popular historian Lev Gumilyov pointed out in his Ancient Turks that the Kypchaks, one of the ancestors of modern Tatars, came from the Zheliang Valley in the Altay Mountains. In his opinion, the nearby Zheliang Mountain and Zheliang settlement were named after Zilant the White Snake. If there is any truth in Lev Gumilyov's idea, then the dragon of Kazan should be regarded as a remnant of the once popular Turkic totem. These flying snakes were also known in Bolghar, Suar, Bilär and the other cities of Volga Bulgaria. For the most part, these snakes were benevolent. However, in the boundary fortresses of Kazan, Alabuğa and Cükätaw, legends about flying monsters flourished. One particular fortress on the Shishma River was known as Yılantaw, later russified as Yelantovo. Many scholars believe that Zilant, like other flying snakes, symbolized the evil rulers of the neighboring pagan peoples. The legendary burning of the snakes may symbolize the victory of Islam over paganism. Sceptics say that the Bulgars purposefully spread those legends in the border regions in order to dismay their neighbors. There is also speculations that Zilant's origination was not from the White Snake, but the Falcon (), an image similar to Zilant from an earlier epoch. Zilantaw in Kazan Zilantaw Hill (originally Tatar , , , Snake Mount), associated with Zilant legends, was formerly situated on the bank of Kazanka River. Some researchers support the view that Kazan was founded here, citing ancient Tatar legends as support. Other legends place the city foundation at Iske Qazan, the Qaban settlement, an Old Tatar settlement from the 16th century. However, these legends ignore the Kazan Kremlin, which is actually