Gustave Schlumberger

Gustave Léon Schlumberger (17 October 1844 – 9 May 1929) was a French historian and numismatist who specialised in the era of the crusades and the Byzantine Empire.

A large portion of his extensive Crusader coin collection is housed in the Cabinet des Médailles a department of the Bibliothèque nationale de France in Paris.

After this he travelled extensively in North Africa, Syria, Asia Minor, Spain, Portugal, Switzerland and Italy (visiting also Germany) and then turned to research into the history of the Crusader states and the Byzantine Empire.

[5] With Edgar Degas, Jean-Louis Forain and Jules Lemaître, he stormed out of the salon of the hostess Genevieve Straus when her friend Joseph Reinach pointed out Dreyfus' innocence.

[8] In his memoirs, Schlumberger, who received a passing mention in Proust's À la recherche du temps perdu,[9] described the novelist as 'bizarre' and described his books as 'admired by some, and quite incomprehensible to others, including myself'.