How did Nicolas Poussin make the second Seven Sacraments series historically accurate?

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To achieve historical accuracy in his second Seven Sacraments series (1644–1648), Nicolas Poussin meticulously researched and recreated the visual environment of the early Christian era.1

Rather than relying on contemporary settings, he sought to authentically represent the architecture, furniture, and costumes as they would have appeared during that period. This commitment to archaeological precision was a central achievement of his career and helped establish the doctrine of "decorum," a principle later codified by the French Academy that significantly influenced the development of history painting.1