Worked at · 1844–1857
Notre-Dame de Paris
The competition to restore Notre-Dame was launched in 1842 and won in 1844 by Lassus and Eugène Viollet-le-Duc. Their submission proposed a deliberate restraint — "une religieuse discrétion", a complete self-effacement before the building. Lassus died in 1857 with the work unfinished; Viollet-le-Duc carried it on, and the spire they designed together stood until the 2019 fire.

