For the present structure, we must be grateful to the great restorer-architect Eugyne Viollet-le-Duc, who did extensive renovations from 1845 to 1863 in response to the public outcry started by Victor Hugo's novel, Notre-Dame de Paris.
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We should be grateful to the restorer-architect who did renovations on the present structure in the past.
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We shouldn't care about Eugyne Viollet-le-Duc at all.