The Seven Lamps of Architecture is an extended essay, first published in May 1849 and written by the English art critic and theorist John Ruskin. The 'lamps' of the title are Ruskin's principles of architecture, which he later enlarged upon in the three-volume The Stones of Venice. To an extent, they codified some of the contemporary thinking behind the Gothic Revival. At the time of its publication, A. W. N. Pugin and others had already advanced the ideas of the Revival and it was well under way in practice. Ruskin offered little new to the debate, but the book helped to capture and summarise the thoughts of the movement. The Seven Lamps also proved a great popular success, and received the approval of the ecclesiologists typified by the Cambridge Camden Society, who criticised in their publication The Ecclesiologist lapses committed by modern architects in ecclesiastical commissions.

Rouen Cathedral is a Catholic church in Rouen, Normandy, France. It is the see of the Archbishop of Rouen, Primate of Normandy. It is famous for its three towers, each in a different style. The cathedral, built and rebuilt over a period of more than eight hundred years, has features from Early Gothic to late Flamboyant and Renaissance architecture. It also has a place in art history as the subject of a series of impressionist paintings by Claude Monet, and in architecture history as from 1876 to 1880, it was the tallest building in the world.