Giovanni Francesco Barbieri (1591 – 1666), best known as Guercino, or Il Guercino, was an Italian Baroque painter and draftsman from the region of Emilia, and active in Rome and Bologna. The vigorous naturalism of his early manner is in contrast to the classical equilibrium of his later works. His many drawings are noted for their luminosity and lively style. Guercino was remarkable for the extreme rapidity of his executions: he completed no fewer than 106 large altarpieces for churches, and his other paintings amount to about 144. He was also a prolific draftsman. His production includes many drawings, usually in ink, washed ink, or red chalk. Most of them were made as preparatory studies for his paintings, but he also drew landscapes, genre subjects, and caricatures for his own enjoyment. Guercino's drawings are known for their fluent style in which "rapid, calligraphic pen strokes combined with dots, dashes, and parallel hatching lines describe the forms".