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The fact that international law is not static but rather dynamic and evolving finds an eloquent expression in the prohibition of the use of force and its subsequent repercussion regarding the criminalization of the act of aggression.

By Laurens Winkel, President of the Grotiana Foundation.

Guest blog by Bastiaan van der Velden.

Doves are often associated with the concept of Peace and Pacifism. You see them in political cartoons, on banners and signs at events promoting Peace.

An excavation team was assembled consisting of J.L. Wortman, A.S. Coggeshall and W.H. Reed and got to work.

But noticeable, cracks had appeared in the façade of unity. The United Kingdom, France and Italy, exhausted by the gruelling trials of war, were eager to enjoy the spoils of war, to rest and rebuild.

The 1918 poster "Joan of Arc Saved France", by Haskell Coffin (1878-1941), was commissioned by the United States Treasury Department as part of the campaign to raise money for the First World War by having civilians buy war savings stamps.

American Railroad advertisement poster, Keep ‘em going! ”Every bad order Locomotive is a Prussian soldier. Every life Locomotive is an American soldier. Let us get on the top Prussian Locomotives and make American soldiers out of them”.

Recruitment poster for the United States Army. Marching soldiers. Some soldiers are making an inviting gesture. Text:

Postcard from the days of the First World War. Dated 1919. With text in German:

German propaganda poster that expresses Germany’s fear for British bombing of their industrial plants from Belgium soil. Image: map of Germany’s main industrial area. Around the map bombers and destroyed industrial plants are depicted.

Commemorative poster for World War I. A lone soldier stands in a field of poppies, his head bowed as he looks down at a simple wooden grave cross. He holds his helmet in his left hand and has his rifle over his shoulder. In the background are the ruins of a house.

Recruitment poster for the American Red Cross. A young woman holding an American flag. On the background the Congress building is depicted. With a quote of Woodrow Wilson, president of the United States: “I summon you to Comradeship in the Red Cross.”

Black and orange colored World War I poster depicting Kaiser Wilhelm II with a German helmet watching an U-boat and a sinking ship with smoke rising from it.

Postcard from the days of the First World War. Translated from Dutch: ‘Did you already see the Peace Palace from the inside?’. On the back: Postcard. Lithography Van de Ven – The Hague. Dated 1914.

Picture album of the First World War in 1914 for children. On the cover: the Peace Palace. Special issue of the Dutch magazine "Panorama". Author: Piet Hoorweg, Journalist from Dordrecht; Introduction by Johan Been, municipal archivist of Den Briel. 1915. A.W.

Poster from World War I expressing German anxiety over the proposed construction of a Channel Tunnel linking Belgium and England, c.1914-1918. Translated from German: Can Belgium be allowed to become England’s deployment area?

Postcard from the days of the First World War. Translated from Dutch: ‘Disturbed Peace-Illusion’. On the back: 'Disturbed Peace-Illusion. The Angel of Peace expelled from the Peace Palace by the War Demon'. Weenenk & Snel, The Hague. 14 67695. Dated 1914.

Cartoon map of Europe at the beginning of World War I. The map is showing Austria-Hungary at the centre, depicted as the tragic and buffoonish Pierrot character of European pantomime, who eternally pines for an unrequited love. Is it Germany’s love that Austria pines for?

"The Peace Palace as European Heritage"