vicomte de Gabriel Joseph de Lavergne Guilleragues

Born in Bordeaux in 1628, Guilleragues studied law before making his way into Paris literary society, where he became known for his wit and connections. He also held public roles, including work close to the royal court and as director of the Gazette de France, showing that his career reached well beyond belles-lettres.

He is most often linked with the Lettres portugaises (Portuguese Letters), first published in 1669. Modern reference works generally treat him as the likely author of this influential book, though the work's history has long inspired debate because it originally appeared as a translation of letters written by a Portuguese nun.

Later in life, he served as French ambassador to the Ottoman Empire. He died in Constantinople in 1685, leaving behind a reputation shaped by both public service and one of the most famous literary mysteries of the French seventeenth century.