Cyprien Tanguay (15 September 1819 – 28 April 1902) was a French Canadian priest and historian. Biography He was born at Quebec in 1819 and died in 1902. After a course of classics and theology at Quebec Seminary, he was ordained in 1843. The first twenty-two years of his priesthood were devoted to parochial work, especially at Rimouski, where he greatly contributed to the foundation of the future diocesan seminary. His early taste for genealogical studies fully manifested itself after his official appointment to the Agriculture, Immigration, and Statistics Ministry,(1865). His whole time was henceforth spent in genealogical research compilation based largely on in-situ consultation of catholic parish registers throughout Quebec, the Maritime provinces, Ontario, and the old French settlements in the United States. He also twice visited Europe for the same purpose. As the result of his labours he published (1871–90) his , comprising seven large double column volumes of over six hundred pages: a colossal undertaking, fit for a numerous body of collaborators, which he achieved alone. Although he was unable to realize the latter part of his program entirely and many inaccuracies have crept into his work, yet on the whole it is highly reliable and almost unique. Every French Canadian by completing from contemporary registers the information supplied by this dictionary can proudly trace back his genealogy to his ancestors from old France. It has proved valuable for the discovery of canonical impediments to marriage through relationship, and has given birth to a copious genealogical literature of less comprehensiveness. In recognition of his labours the author received a prelature from Leo XIII (1887). He also published (1868) and (1886). Tanguay's Works Tanguay, Cyprien (1868), Répertoire Général du Clergé Canadien par ordre chronologique depuis la fondation de la colonie jusqu’à nos jours, Québec, C. Darveau, Imprimeur-éditeur, 321 pp. Tanguay, Cyprien (1871-1890). Dictionnaire Généalogique des Familles Canadiennes (DGFC) depuis la fondation de la colonie jusqu’à nos jours Montréal (Canada), Eusèbe Senécal et fils, Imprimeurs-éditeurs : Volume I (1871), 1608-1700, 623 pp. [ABEL to ZAPAGLIA]. Volume II (1886), 1700-1760, 622 pp, [ABEL to CHAPUY]. Volume III (1887), 1700-1760, 607 pp. [CHARBONNEAU to EZIÉRO]. Volume IV (1887), 1700-1760, 608 pp. [FABAS to JININE]. Volume V (1888) 1700-1760, 608 pp. [JOACHIM to MERCIER]. Volume VI (1889) 1700-1760, 608 pp. [MERCIN to ROBIDOUX]. Volume VII (1890) 1700-1760, 688 pp. [ROBILLARD to ZISEUSE]. Tanguay, Cyprien (1885), Monseigneur De Lauberivière, cinquième évêque de Québec