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1 (of 5) Henri La Fontaine and Ludwig Quidde at the opening session of the XXIIIrd Universal Peace Congress in the Reichstag Room, Berlin, 1924.

Mundaneum. Public domain, via Wikimedia Commons. Photography Continental Photo, Berlin.

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2 (of 5) Henri La Fontaine and his wife Mathilde Lhoest in the dining room of their house on the Vergote Square, 1932.

Photo: Mundaneum. Public domain, via Wikimedia Commons

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3 (of 5) Henri La Fontaine at the piano, 1930.

Photo: Mundaneum. Public domain, via Wikimedia Commons

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4 (of 5) Henri La Fontaine in front of the Reichstag room in Berlin, where the XXIIIrd Universal Peace Congress was held, 1924.

Photo: R. Horlemann. Mundaneum. Public domain, via Wikimedia Commons

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5 (of 5) World Peace Congress in Munich 1907: Bertha von Suttner (seated row, second from left), Ludwig Quidde (next to the right), Frédéric Passy (next to the right), Henri La Fontaine (to her right) and A. H. Fried (standing row, third from the right).

Photographer unknown. Public domain, via Wikimedia Commons.