The Ten CommandmentsLucas Cranach the Elder, the court painter for the elector of Saxony, painted this giant illustration of the Ten Commandments (more than 5 feet by 11 feet) for the city hall in Wittenberg in 1516, just at the point when Luther was beginning to question Catholic doctrine. Cranach was an early supporter of Luther, and many of his later works depict the reformer and his ideas. Paintings were used by both Protestants and Catholics to teach religious ideas. (Lutherhalle, Wittenberg, Germany/The Bridgeman Art Library)