I decided to implement a cut-off date here due to the fact that it becomes increasingly difficult to tell which cities hit this milestone or not.
While it's almost certain that Rome and Baghdad once had 1 million inhabitants prior to 1775, the population figures for other cities like Alexandria, Xi'an, Hangzhou, etc. reaching that mark is still debatable and not commonly agreed upon.
While it's almost certain that Rome and Baghdad once had 1 million inhabitants prior to 1775, the population figures for other cities like Alexandria, Xi'an, Hangzhou, etc. reaching that mark is still debatable and not commonly agreed upon.