In 1884 he graduated with two theses, Simon de Montfort and La Condamnation de Jean Sansterre (Revue historique, 1886). His Les Chartes des libertés anglaises (1892) has an introduction upon the history of Magna Carta, etc., and his History of Europe from 395 to 1270, in collaboration with G Monod, was translated into English.
He was also responsible for the continuation of the Gascon Rolls, the publication of which had been begun by Francisque Michel in 1885 (supplement to vol. 5., 1896; vol. ii., for the years 1273-1290, 1500; vol. iii., for the years 1290-1307, 1906). He received the honorary degree of Litt. Doc, at Oxford in 1909. He was made a member of the British Academy in 1914.
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