Xavier de Theux or Xavier Marie Georges Théodore De Theux de Montjardin (23 September 1838 — 13 December 1896) was a Belgian bibliophile and president of the Société des bibliophiles de Belgique.
Biography Xavier Marie Georges Théodore De Theux de Montjardin was born in Sint-Truiden, Limburg, Flemish Region, Belgium on 23 September 1838.Poplimont, C. (1867). La Belgique héraldique: recueil historique, chronologique, généalogique et biographique complet de toutes les maisons nobles, reconnues de la Belgique .... Belgium: Typ. de G. Adriaens.
De Theux obtained a Doctorate of Law.Brassinne, J. (1926). Theux (Xavier-Marie-Georges-Théodore, chevalier de, de Montjardin), bibliographe. Biographie Nationale, 24, 784-786. He married Eugénie de Thysebaert in Namur on 18 May 1865.
Joining the Liège Bibliophile Society in 1863, he later presided over the Society of Bibliophiles of Belgium () in 1865. Xavier de Theux served as president of the society, with Ferdinand Van Der Haeghen as vice president, Gustave Hagemans as treasurer, and Jules Delecourt as secretary.Le bibliophile belge. (1866). Belgium: librairie ancienne et moderne.
Death Xavier de Theux died in Brussels on 13 December 1896.
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