This portrait of Alexandre Herculano (circa 1850) is by José Rodrigues.
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Imagen subida por claudiofsramos el May 25, 2013.
Derechos de autor: I took it from Wikipedia, and it appears to be public domain, since I've seen this portrait all my life in many books; and, nowadays, websites. In fact, I think it is the only existing image of the great Portuguese writer, who died in 1877. Don't know about any copyrights.