Source Data Reference for:

City = Baghdad
Time = 600

City	Year	Size	Size Comment	Year Comment	Author	Title	Location
Ctesiphon	500		becomes largest in the world overtaking Constantinople		Tertius Chandler	Four thousand years of urban growth	p525
Ctesiphon	500	400,000			Tertius Chandler	Four thousand years of urban growth	p465
Ctesiphon	500	400,000			George Modelski	World Cities -3000 to 2000	p55
Ctesiphon	528	36,000	"btw 23,000 & 49,000"		Colin McEvedy	The New Penguin Atlas of Medieval History ISBN 0-14-051249-7
Ctesiphon	540		Antioch entire pop brought to Ctesiphon		Tertius Chandler	Four thousand years of urban growth	p105
Ctesiphon	550	10,000		6th c	Colin McEvedy	Cities of the Classical World	p127
Ctesiphon	570		becomes largest in the world overtaking Constantinople		Tertius Chandler	Four thousand years of urban growth	p527
Ctesiphon	575	500,000			Tertius Chandler	Four thousand years of urban growth	p525
Ctesiphon	590	0	deserted	6th c	Colin McEvedy	Cities of the Classical World	p126
Ctesiphon	600	500,000			George Modelski	World Cities -3000 to 2000	p55
Ctesiphon	622	400,000	"100,000 households"		Tertius Chandler	Four thousand years of urban growth	p105
Ctesiphon	622	500,000			Tertius Chandler	Four thousand years of urban growth	p531
Ctesiphon	622	500,000			Tertius Chandler	Four thousand years of urban growth	p522
Ctesiphon	622	500,000			Tertius Chandler	Four thousand years of urban growth	p466
Ctesiphon	622	500,000			Tertius Chandler	Four thousand years of urban growth	p537
Ctesiphon	622	500,000			Tertius Chandler	Four thousand years of urban growth	p532
Ctesiphon	637		falls to Arabs		Tertius Chandler	Four thousand years of urban growth	p525