Question: Population of the roman empire at its peak?
Disambiguated questions and answers: question: What was the official total population of the roman empire at its peak?
Population of the official roman empire at its peak compared to the world population?
Argued population of the roman empire at its peak according to recent demographic studies?
answer: 55–60 million
56,800,000
largest population of any unified political entity
between one-sixth and one-fourth of the world's total population
70 million to more than 100 million
Natural Questions answer: 60 -- 70 million (from the Wikipedia article "Demography of the Roman Empire")