763 - 766 BAGHDAD (Persia)
Baghdad was built as the capital of the Abbasid by the Caliph Al Mansur (754-775), successor to Al Abbari. The Jewish mathematician and astronomer Masha'allah/Mashallah Ibn Athari(see 640), together with a Persian astronomer Ab-Naubakht/Naubakht Ahvazi, were responsible for planning the city, which by the 13th century had a perimeter of 20 miles, 10,000 streets and a population of almost 2,000,000.
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