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He was an historical expert on Who Do You Think You Are? where he helped explain to Davina McCall about the role her Grandfather played in the Dreyfus Affair.
Osaragi was deeply influenced by French literature and culture, and wrote a number non-fiction pieces displaying his deep understanding of controversial events in Europe: Dorefyus jiken ("The Dreyfus Affair"), Buranje Shogun no Higeki ("The Tragedy of General Boulanger"), and Pari Moyu ("Paris is Burning"; a history of Paris Commune).
Further items reflect legal history from the 17th century to the present, including manuscripts and exhibits from the trials of Louis XVI, Marie Antoinette, Émile Zola at the Dreyfus affair, Michel Ney, Pierre Cambronne, Villain (assassin of Jean Jaurès), and Alexandre Stavisky.
The affair gained fame, particularly in socialist circles, as the Dutch pendant of the French Dreyfus Affair, and Troelstra's role was, perhaps not coincidentally, not unlike that played by Émile Zola.
He apparently spoke to Lucien Herr—the librarian of the École Normale from 1888 to 1926 who was associated with Durkheim and his students, and who was active in the socialist movement and the Dreyfus Affair—who advised Granet, when the latter thought of considering the Japanese case, to seek the advice of respected sinologist Edouard Chavannes, then apparently the nearest Granet could get in Paris to an expert on Japan.