[CHERIN (L. N. H.) & VERGÈS]. Genealogy of the house of Montesquiou-Fezensac, followed by its proofs. Paris, Imprimerie de Valade, 1784. In-4 of [4]-92 pp, 270-[2] pp, [1] f. (errata), a folding table and several woodcut figures in the text. Cherry half calf, spine ribbed and decorated, title page (19th c. binding). First edition. The House of Montesquiou (Gascony) is one of the oldest surviving families of the French nobility, originating from Montesquiou, with a proven lineage dating back to 1190, but recognised by Chérin in 1774 as having descended around 1070 from the ancient counts of Fezensac. It has produced three marshals of France, an admiral, a cardinal, two bishops, several general officers, a minister, deputies and senators and two members of the Académie française. Bound at the end: [BULTEAU DE PREVILLE], Généalogie de Le Roux d'Esneval, Seigneurs de Pavilly. Rouen, 1692], 2 ff. manuscript title, 63 pp. (including 3 in manuscript copy), a large folding engraved genealogical table ("Les trente-deux quartiers du chevalier d'Esneval"). A fine copy. Very large armorial bookplate on the flyleaf (Le Filleul des Guerrots) and wet stamp of the library of the Château des Guerrots (Farcy sale, Tours 1903). Ex-libris JM (Barbier II, 530.)