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In page Auguste Molinier:

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He was a good palaeographer and had a thorough knowledge of archives and manuscripts; and he soon won a first place among scholars of the history of medieval France. His thesis on leaving the École des Chartes was his Catalogue des actes de Simon et d'Amauri de Montfort (inserted in vol. xxxiv of the Bibliothèque de l'École des Chartes), an important contribution to the history of the Albigenses. This marked him out as a capable editor for the new edition of L'histoire générale de Languedoc by Dom Vaissète: he superintended the reprinting of the text, adding notes on the feudal administration of this province from 900 to 1250, on the government of Alphonse of Toulouse, brother of St Louis (1220–1271), and on the historical geography of the province of Languedoc in the Middle Ages.[1]