The city had approximately one million residents, and the army massacred many of them. It was a horrendous act that, in one fell swoop, brought an end to the Islamic Golden Age.
IOW, it was a huge break for the rest of the world. Thanks fieldmarshaldj for the ping, thanks vannrox for the topic.
Interesting thought experiment to speculate what might have been if this empire had continued to the time of the Ottoman Empire. Might it have been a rival? But, that assumes Mongols would not act like Mongols and a dumb@$$ Caliph wasn't a, well . . .