included in his devotional diptychs and triptychs. Examples are the left wing of the Saint Hippolytus Altarpiece, the central and right panels of which are by Dieric Bouts (c. 1475, Groeningemuseum, Bruges), the Portinari Alarpiece, the Trinity Altarpiece (between 1473 and 1478, Scottish National Gallery, Edinburgh) and the fragments of altarpieces such as the Portrait of a Man at Prayer with St John the Baptist (Walters Art Museum) and the Portrait of a Man. The portraits included in these devotional works typically depicted a man or woman in prayer, who appear to be experiencing some vision, often of the Virgin Mary. The Portrait of a Man (c. 1575, Metropolitan Museum of Art, New York) is a good example of his portrait work. This small panel was cut down to its current oval shape from its original rectangular format. It formed likely the right wing of a small altarpiece known as a diptych, which is only made up of two panels. Alternatively, a portrait of the sitter's wife may have been painted on a panel on the right of a central panel depicting a Christian scene, so that as a whole the artwork formed a conventional triptych. The Christian scene was likely a depiction of the Virgin and Child. In the Portrait of a Man van der Goes demonstrated his skills as a portrait painter through his ability to bring out the sitter's resolute bearing and strength of character. He achieved these effects by placing the sitter on a higher level than the viewer and by creating a contrast between the face that catches the light from outside and the dark wall behind it. Van der Goes used chiaroscuro effects to further accentuate the modeling of the facial features, which appear to be made of stone. These features as well as the appearance of the hands and background after they were painted over by later restorers may explain why scholars previously attributed this male portrait to the Italian painter Antonello da Messina. The stark realism of Hugo van der Goes's approach, with its meticulous rendering of the dark tones in the man's face, the stubble on his chin and his rough hands joined in prayer, creates the impression that the sitter of the portrait was gripped by a strong feeling of devotion. The donor portrait of Hippolyte de Bertohoz on the left wing of the Saint Hippolytus Altarpiece and Edward Bonkil's