to create prayer books for the laity, often known as books of hours due to their use at prescribed times of the day. Among the earliest is an example by William de Brailes that seems to have been written for an unknown laywoman living in a small village near Oxford in about 1240. Nobility frequently purchased such texts, paying handsomely for decorative illustrations; among the most well-known creators of these is Jean Pucelle, whose Hours of Jeanne d'Evreux was commissioned by King Charles IV as a gift for his queen, Jeanne d'Évreux. Elements of the French Gothic present in such works include the use of decorative page framing reminiscent of the architecture of the time with elongated and detailed figures. The use of spatial indicators such as building elements and natural features such as trees and clouds also denote the French Gothic style of illumination. From the middle of the 14th century, blockbooks with both text and images cut as woodcut seem to have been affordable by parish priests in the Low Countries, where they were most popular. By the end of the century, printed books with illustrations, still mostly on religious subjects, were rapidly becoming accessible to the prosperous middle class, as were engravings of fairly high quality by printmakers like Israhel van Meckenem and Master E. S. In the 15th century, the introduction of cheap prints, mostly in woodcut, made it possible even for peasants to have devotional images at home. These images, tiny at the bottom of the market, often crudely coloured, were sold in thousands but are now extremely rare, most having been pasted to walls. Altarpiece and panel painting Painting with oil on canvas did not become popular until the 15th and 16th centuries and was a hallmark of Renaissance art. In Northern Europe the important and innovative school of Early Netherlandish painting is in an essentially Gothic style, but can also be regarded as part of the Northern Renaissance, as there was a long delay before the Italian revival of interest in classicism had a great impact in the north. Painters like Robert Campin and Jan van Eyck made use of the technique of oil painting to create minutely detailed works, correct in perspective, where apparent realism was combined with richly complex symbolism arising precisely from the realistic detail they could now include, even in small works. In Early Netherlandish painting, from the richest