Initially smaller altarpieces such as the Klaren Altar in the Cologne Cathedral from about 1360–70 were created, based on book paintings from around the year 1300. The mid-15th century is the high-point of this school, when Stefan Lochner (active 1442–1451) created the Altar of the City Patrons, which is considered to be the greatest masterpiece of the Cologne School. A third creative period followed, under the influence of Netherlandish painters such as Rogier van der Weyden. Rogier's influence is especially notable in the work of the outstanding representative of this final phase, the anonymous painter known as the Master of the Saint Bartholomew Altarpiece. For example, the latter's large Deposition of Christ resembles the same theme represented in the former's Escorial altarpiece, and the Master's heightened naturalism and emphasis on tear-stained features reflect Rogier's emotionalism.
The artists of the Cologne School include Stefan Lochner and William of Cologne, as well as a number of artists identified only by the works they created:
The Cologne painters worked mainly in the area of Old Cologne around the Schildergasse, the artists' quarter, where sign painters were also active.
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