Ben Johnson was a leading figure of the Elizabethan and Jacobean eras. He created "types" of human behaviors based on the medieval theory of the four humours. Johnson is known for his stylish satires such as Volpone and The Alchemist. Other notable figures included Beaumont and Fletcher, known for their comedy The Knight of the Burning Pestle. The King James Bible was also a major project of this time. Major poets included the Metaphysical poets John Donne and George Herbert, who wrote on Christian mysticism and eroticism. Theater remained popular but was closed during the Puritan Revolution.