ANDRADE, Manuel Carlos de.- Luz da liberal e nobre arte de cavallaria.- Lisboa: na Regia Officina typografica, 1790.- XXVI, 454, [1, 1 br.] p.: 1 retrato, 93 gravuras; 35 cm.- E. Complete copy (with the rare final errata leaf) and with good margins, of one of the most beautiful books printed in Portugal in the 18th century, and certainly one of the most sought after. Little is known about the author (1755-1817), apart from having been horse riding instructor of the Picaria Real (art of horsemanship schooling), as he himself indicates on the title page. Inocêncio adds that some intended to attribute the work to the Marquis of Marialva, but this has not yet been confirmed. The 93 engravings, 22 of which are foldable, mainly represent horse attitudes in teaching and are opened on copper plate by various engravers, Fróis, Martini, Piedra, etc. (Ernesto Soares, História, 1076), according to originals by Joaquim Carneiro da Silva. The prince regent, future king D. João VI, is represented in engravings 21, 29, 53 and 59 (Ernesto Soares e Ferreira Lima, Dictionary of Iconography, 1549 B). It also includes two allusive vignettes at the beginning of books I and VI. Clean copy (possibly treated), with some wormholes (restored), mainly marginal ones, in about a third of the engravings, affecting the engraved part in four engravings (76, 86, 90 and 93); some text sheets also have small wormholes that, from page 389/390 onwards, sometimes reach the text, always without great extension. Recent binding, full sheepskin, with patina and gold decoration on the squares covers and smooth spine, in the manner of the time. Inocêncio, V, 386. Ameal, 108.