Corneille de Lyon was a painter of small-scale portraits - almost miniatures - who was born in The Hague and settled in Lyons, where he was naturalized in 1547, and where he and his family, who were Huguenots, became Catholics in 1569. In 1540 he was made Painter to the Dauphin (later Henri II), and in 1551 the Venetian Ambassadour described a visit to his studio, where he saw many small portraits of courtiers.
After the death of Henri II in 1559 Corneille continued to work for the Court. The only definate attribution is a portrait of an unknown man in a French private collection, which is inscribed on the back as having been painted in 1533 by 'Corneille de La Haye' - i.e. Corneille from The Hague. All other attributions of his distinctive little half-length portraits, usually of men in black, very delicately modelled, against a green or blue background, are based on this single work, which is nearer to the larger portraits by Joos van Cleve than to anything being produced in France or the Low Countries.
There are examples in Amsterdam, Boston, Cleveland Ohio, Edinburgh (SNPG), London (NG, Wallace Coll.), Paris (Louvre) and New York (Met. Mus.).
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Source: The Penguin Dictionary of Art and Artists (Penguin Reference Books)