Portrait of a man in a turban (self-portrait?)

http://data.europeana.eu/agent/147010 · 1433

This painting is an early example of the inclusion of Greek letters into the visual art. The upper frame shows the artist's Flemish motto in Greek lettering ("Als ich can"; meaning "as I can [but not as I would like]" or "as best as I can"). Perhaps the use of Greek was intended to give the motto a proverbial quality.