cities of Northern Europe, a new minute realism in oil painting was combined with subtle and complex theological allusions, expressed precisely through the highly detailed settings of religious scenes. The Mérode Altarpiece (1420s) of Robert Campin and the Washington Van Eyck Annunciation or Madonna of Chancellor Rolin (both 1430s, by Jan van Eyck) are examples. For the wealthy, small panel paintings, even polyptychs in oil painting were becoming increasingly popular, often showing donor portraits alongside, though often much smaller than the Virgin or saints depicted. These were usually displayed in the home. Sculpture Monumental sculpture The Gothic period is essentially defined by Gothic architecture, and does not entirely fit with the development of style in sculpture in either its start or finish. The facades of large churches, especially around doors, continued to have large tympanums, but also rows of sculpted figures spreading around them. The statues on the Western (Royal) Portal at Chartres Cathedral (c. 1145) show an elegant but exaggerated columnar elongation, but those on the south transept portal, from 1215–20, show a more naturalistic style and increasing detachment from the wall behind, and some awareness of the classical tradition. These trends were continued in the west portal at Reims Cathedral of a few years later, where the figures are almost in the round, as became usual as Gothic spread across Europe. Bamberg Cathedral has perhaps the largest assemblage of 13th century sculpture, culminating in 1240 with the Bamberg Rider, the first life-size equestrian statue in Western art since the 6th century. "In Italy the Gospel of Gothic was preached from pulpits not from tympana, and the unit of the sculptor's thinking was an autonomous, self-consistent work of art" (John Pope-Hennessy). Nicola Pisano (1258–78) and his son Giovanni developed a style that is often called Proto-Renaissance, with unmistakable influence from Roman sarcophagi and sophisticated and crowded compositions, including a sympathetic handling of nudity, in relief panels on their pulpit of Siena Cathedral (1265–68), the Fontana Maggiore in Perugia, and Giovanni's pulpit in Pistoia of 1301. Another revival of classical style is seen in the International Gothic work of Claus Sluter and his followers in Burgundy and Flanders around 1400. Late Gothic sculpture continued in the North, with a fashion for very large, wooden, sculpted altarpieces with increasingly virtuoso carving and large numbers agitated expressive figures; most surviving examples are in Germany, after much iconoclasm elsewhere. Tilman Riemenschneider, Veit Stoss