Population of Rome over Time

The population of the city of Rome fell to remarkably low numbers during the Middle Ages before rebounding in modern times.
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We are aware that there is no year 0, but I couldn't make Google charts work with BC dates
Source. The numbers should be considered rough estimates
level 79
Jul 21, 2018
1084 - the year when the population of Rome was roughly the same as the number of students at my undergraduate college.
level 62
Jul 25, 2018
Wait why'd it drop so much?
level 51
Jul 27, 2018
Rome was sacked multiple times, and it was hit with disease. Due to the constant warfare and disease, most of the population either died or left the city. Because of this, the population had such a drastic decrease.
level ∞
Jul 5, 2019
Another reason had to do with the grain dole. For centuries, citizens of Rome received free or reduced price grain from the government. When this ended, there was no longer as much incentive to live in Rome.