Question: When did construction start on the great wall of china?
Answer: 771 -- 476 BC
Disambiguated annotations:
qaPairs: question: When did construction start on the first versions of the great wall of china?
answer: 771–476 bc
Pre-imperial China
771 BC
question: When did construction start on most parts of the great wall of china visible today?
answer: 1368–1644
Ming dynasty