Van Uffel was a wealthy Flemish merchant and art collector living in Venice. Van Dyck caught him turning in his chair as if he had just been interrupted, the kind of lively pose that made Van Dyck the favorite portraitist of Europe's elite.
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Lucas van Uffel
Anthony van Dyck · The Metropolitan Museum of Art
Anthony van Dyck, ca. 1622. The Metropolitan Museum of Art, Open Access (public domain).