Previously thought (until 1880) to be by Rubens, this work has more recently been attributed to Van Dyck. If so, it would have to date from early in the artist’s career, during his stay in Italy. The subject is based on an engraving after Titian and a Titianesque drawing also attributed to Van Dyck, but with equal lack of certainty, at Chatsworth.
However, recent conservation has made the attribution to Van Dyck less, rather than more, likely. The work may actually be by another, unknown, hand.