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.
The cathedral was enlarged by St. Ouen in 650, and visited by Charlemagne in 769. However, beginning in 841, a series of Viking raids seriously damaged the cathedral complex.
The Viking leader Rollo became first Duke of the Duchy of Normandy and was baptised in the Carolingian cathedral in 915 and buried there in 933. His grandson, Richard I of Normandy, further enlarged it in 950.
In the 1020s, the archbishop Robert began to rebuild the church in the Romanesque style, beginning with a new choir, crypt and ambulatory, and then a new transept. The Romanesque cathedral was consecrated by the archbishop Maurille on October 1, 1063, in the presence of William, Duke of Normandy, soon to become William the Conqueror after his conquest of England in 1066.