He lived 820 to 893 and studied under the musician Ishaq al-Mawsili or Isaac of Mosul [767 to 850].
Hamadan is in west Iran and is where Mede capital Ecbatana was.
He wrote about traveling from Baghdad to Volga River to see Bulgar king [921 to 922].
He described Isfahan's twenty districts {rostaq}, gates, and walls and wrote about Sana'a (Yemen), Novgorod, Burka, Croatia, and Caucasia.
He wrote about windmills.
He described Kiev [977] and defeat of Volga Bulgars and Khazars [969] by Rus.
He lived 1099 to 1166, drew a world map [1130], and was at King Roger II's court [1145 to 1166], where he built a silver globe.
He lived 1512 to 1594, drew maps [1554], and created Mercator's projection [1569].
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Date Modified: 2022.0225