The painter Francisco Pacheco (ca. 1564–1644) was Velázquez’s teacher and, eventually, father in law; his biography of the artist was part of his larger theoretical work The Art of Painting, which has long been an important source on seventeenth-century Spanish art. The Baroque painter Antonio Palomino is the author of El Museo pictórico y escala óptica; its artistic biographies have caused Palomino to become known as the Spanish Vasari. Born just after Velázquez died, he knew many of the painter’s friends and colleagues, on whom he drew extensively for this study.