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Auguste de Keralio (c. 1715 – 1805) was a French military man. He was made a knight of theOrder of Saint Louis and gentleman of the chamber to the Prince of Parma on 2 October 1760. He was also known as the marquis of Keralio.
The son of the squire François Fiacre Guinement, seigneur de Keralio and of Marguerite Rose Bodin, Auguste entered the military academy in the citadel atMetz on 15 June 1732, aged just 17. He was made a lieutenant in the Carhaix battalion of the Brittany militia on 1 August 1733. He stayed in it until 8 February 1734, when he joined therégiment d'infanterie d'Anjou, in which his elder brother Felix François Guinement lost his life whilst serving as a lieutenant at theSiege of Philippsbourg on 18 July 1734.
Auguste saw action in theWar of the Polish Succession – in May 1734 served atthe battle at Colorno. He also fought atSan Pietro before his regiment was sent to relieve the bataillon du Dauphin, then blockaded by Imperial forces atSecchia (18 September 1734). He fought atGuastalla on 21 September, where one of his contemporaries from the Metz military school, lieutenant Charles de Pagès, was seriously wounded. After the capture of Mirandole, Keralio was sent into winter quarters atSan Secondo in theDuchy of Parma.
In 1735 he took part in the capture of the castles at Gonazgue,Reggiolo andRevere, for which he was made anaide-major on 29 August that year. He returned to France in September 1736. On 13 January 1741 he was made a captain and put in command of a company of the 2nd battalion of the régiment d'Anjou, fighting with them in the Bohemian theatre of theWar of the Austrian Succession. As a capitaine aide-major, he was second-in-command to the regiment's colonel, the marquis d'Armentières, at Egra in June 1742, during theSiege of Prague. In 1747de Belle-Ile put de Keralio in command of the Fourrages army depot inMarseille. In 1749 he left the army, but at the request ofLouise-Élisabeth was later given the rank of 'colonel réformé' in 1757.
In 1754 he was made preceptor to the young count of Gisors, de Belle-Isle's son, and accompanied him on hisGrand Tour of Europe. During this he metFrederick II of Prussia,Maria Theresa I, Empress of Hungary,George II of Great Britain and many other monarchs. In 1756 he became secretary to his close friend theDuke of Nivernais during the latter's embassy to the King of Prussia.
He was made an honorary member of theAcademy of Fine Arts of Parma on its creation in 1757, writing to it from Paris. That year also saw the Duke of Nivernais recommending de Keralio toLouis XV as one of the three under-governors toLouis de France or as sub-governor to the infantFerdinand, Duke of Parma. He and abbéCondillac were put in charge of Ferdinand's education from 8 March 1757 to 1769, teaching him philosophical ideas, putting intelligence and understanding at the centre of his education and attempting to mould him as a philosopher-king. Surrounded by the clergy of Parma and representatives of the Austrian court, Ferdinand was unable to put his knowledge and education into practice.
On his return to France, he was granted a pension of 10,000 livres byLouis XVI, a pension of 10,000reales billon byCharles III of Spain on the commandery of Onda belonging to theOrder of Montesa and an apartment in thepalais du Luxembourg, where he became a neighbour of the futureLouis XVIII. From 1769 until his death de Keralio divided his time between his apartment and the hôtel de Tournon, residence of the Duke of Nivernais. He regularly helpedCondorcet translate mathematical texts and became his secretary between 1770 and 1780. De Keralio was imprisoned for several months during theReign of Terror and was only saved from the guillotine by the intervention of his nieceLouise-Félicité de Kéralio. He died in Paris in 1805 aged 90.