Construction of Rouen Cathedral, in Normandy in north west France, was commenced from 1202-1230. It has a double storeyed nave arcade. It displays stylistic features from early Gothic to late Flamboyant. The façade of the north transcept, the Portail des Libraires, commenced in 1281, shows late Rayonnant characteristics. Rouen was a significant place of study for Ruskin. At the end of the 'Lamp of Sacrifice' Ruskin praises 'one of the smallest niches of the central gate of Rouen' as 'the most exquisite piece of pure flamboyant work existing' ( Works, 8.52). Ruskin visits to Rouen included those made in 1835, 1840, 1842, 1848, 1866 and 1880. In Praeterita Ruskin claims Rouen as one of the three centres of his life's work along with Geneva and Pisa, describing his work at Venice as 'bye-work' ( Works, 35.156). Details of the architecture of Rouen were included in the illustrations for The Seven Lamps of Architecture (1849) and the Cathedral continued to be an important place of study for Ruskin.