Dughet was born in Rome, the son of a French pastry-cook  and his Italian wife. He has always generally been considered as a French painter, although in fact he never visited France. In around 1635 he became a pupil of Nicolas Poussin, who had married his sister Anne five years earlier. Because of this connection he was widely known as "Gaspard Poussin"
He specialised in painting landscapes of the Roman Campagna becoming, along with his exact contemporary Salvator Rosa, one of the two leading landscape painters of his time. He painted several cycles of frescoes, including one, showing various sites around Rome, at the Colonna Palace. He worked with Pier Francesco Mola, Cozza, and Mattia Preti at the Palazzo Pamphilj in Valmontone. He often collaborated with Guillaume Courtois who painted the staffage in his landscapes. This was the case, for instance, in the works for the Palazzo Pamphilj. There is another fresco cycle by Dughet, though in a bad state of preservation, in San Martino ai Monti.
Dughet died in Rome on 27 May 1675.
During the 18th century Dughet's work became especially popular amongst British collectors, to such an extent that his name became attached to almost any classical landscape, and his style proved influential on British landscape painting and garden design. His Sacrifice of Abraham, once the property of the Colonna, is now, with other of his works, in the National Gallery, London.
- Rosenberg, Pierre (1982). "DUGHET Gaspar also known as Gaspar Poussin". France in the Golden Age: Seventeenth Century Paintings in American Collections. New York: Metropolitan Museum of Art. p. 243. ISBN 9780870992957.
- Collectionn "Treasure of the Month - February 2012". Retrieved 6 July 2015.
- Encyclopædia Britannica 1911
- Simonetta Prosperi Valentini Rodinò, Courtois, Guillaume, in: Treccani, accessed 14 March 2015 (Italian)
- This article incorporates text from a publication now in the public domain: Chisholm, Hugh, ed. (1911). Encyclopædia Britannica (11th ed.). Cambridge University Press.
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