Louis-Élisabeth de La Vergne de Tressan

Louis-Élisabeth de la Vergne, comte de Tressan (4 November 1705, Le Mans - 31 October 1783, from a fall from a carriage en route to Saint-Leu-la-Forêt) was a French soldier, physician, scientist, medievalist and writer, best known for his adaptations of "romans chevaleresques" of the Middle Ages, which contributed to the rise of the Troubadour style in the French arts.

Aged 13, he was the companion of the young Louis XV, then lieutenant-général and king's aide de camp at the battle of Fontenoy. He was made governor of Toul and was summoned by king Stanislas to his court at Lunéville, where he received the title of grand marshal.

The first director of the Société Royale des Sciences et Belles-Lettres of Nancy in 1751 and a member of several other academies in France and abroad, he was elected a member of the Académie des sciences in 1749 and of the Académie française in 1780.

A friend of Voltaire and Buffon, he frequented the salon of Mme de Tencin and composed several odes as well as adaptations of chivalric romances, which he translated and adapted from Spanish and Old French, into editions which would be re-issued several times. He was also the author of one of the first treatises on electricity in French, and collaborated on volumes VI and VII of the Encyclopédie of Diderot and D’Alembert.

• Amadis de Gaule, traduction libre (1779)
• Roland furieux. Poème héroïque de l’Arioste (4 volumes, 1780)
• Essai sur le fluide électrique, considéré comme agent universel (2 volumes, 1786). Online text : [1]
• Corps d’extraits de romans de chevalerie (4 volumes, 1782). Containing

• Le Chevalier Robert, ou Histoire de Robert surnommé le Brave (1800)
• Rose Summers, ou les Dangers de l’imprévoyance traduit librement de l’anglais (1805)
• Œuvres (8 volumes, 1822–23)