In the National Gallery in London there are three representations on a single canvas of Charles I. In one his head is turned to the right; in another, to the left; and in the center we find the full-face view. This is the story of this production. Van Dyck painted them for Bernini, the Roman sculptor, that he might by their help make a bust of the king. By combining the impressions so received, Bernini would be better able to produce a “speaking” likeness. One view would not have been enough.
What The Bible Is All About, Henrietta C. Mears, page 348