Thought I would watch episode 4 to see what was served up. Discovered, to my bemusement, that Muhammad ibn Musa al-Khwarizmi was portrayed as an Uzbek. That's news to me - the give away is in his name ak-Khwarizmi - of Khwarezm. He lived during the Abased Caliphate - circa 780 - 850 AD and is famous for al-jibr - better known as algebra. The Uzbeks were still nomadic peoples at this time. Maths had long been studied in places like Babylon and India at this time. Cordoba and Baghdad may have been large by the standards of the petty realms of Europe at that time but that didn't make them the largest cities in the world. In the West Cordoba would have vied with Byzantium for honours, and in Central Asia, several cities could easily have taken the crown - in particular Old Urgench (Konye-Urgench)capital of the Khwazemian Empire. And let's not forget the cities of China (or Song as it was then known). One could go on Misleading in important aspects