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The open book bears an inscription from a later hand (L. Cornaro. Aet. suae 100. 1566). For this reason it has been supposed that this is a portrait of Luigi Cornaro, author of several treatises on the art of growing old. Others have believed it to be a portrait of the Cardinal-Inquisitor Don Gaspar Quiroga.
Two signed and four unsigned versions are known, the best being that in the Frick Collection, New York.
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