Source Data Reference for:

City = Rome
Time = 400

City	Year	Size	Size Comment	Year Comment	Author	Title	Location
Rome	300	800,000			Ian Morris	Social Development
Rome	300	1,000,000			George Modelski	World Cities -3000 to 2000	p49
Rome	310	250,000		early 4th c	Colin McEvedy	The New Penguin Atlas of Medieval History ISBN 0-14-051249-7	p6
Rome	361	150,000			Tertius Chandler	Four thousand years of urban growth	p532
Rome	361	150,000			Tertius Chandler	Four thousand years of urban growth	p464
Rome	361	150,000			Tertius Chandler	Four thousand years of urban growth	p531
Rome	400	800,000			Ian Morris	Social Development
Rome	400	800,000			George Modelski	World Cities -3000 to 2000	p49
Rome	410	125,000		early 5th c	Colin McEvedy	The New Penguin Atlas of Medieval History ISBN 0-14-051249-7	p6
Rome	410	100,000			Tertius Chandler	Four thousand years of urban growth	p102