Jean Jaurès (1859–1914) was a historian and was among the most prominent representatives of reform socialism in French politics. He was assassinated by a nationalist shortly before the outbreak of the First World War (caption by the editorial team).
Jean Jaurès (1859–1914), 1913, black-and-white photograph, photographer unknown; source: with kind permission © Archives of Social Democracy, Friedrich-Ebert-Stiftung Bonn, signature 6/FOTA007050, https://www.fes.de/archiv-der-sozialen-demokratie/.