The Yser Testament ( nl, IJzertestament), officially entitled Open Letter to the King of the Belgians Albert I ( nl, Open brief aan den Koning der Belgen Albert I), was an 11-page

open letter An open letter is a Letter (message), letter that is intended to be read by a wide audience, or a letter intended for an individual, but that is nonetheless widely distributed intentionally. Open letters usually take the form of a letter (mess ...

addressed to

King Albert I Albert I (8 April 1875 – 17 February 1934) was King of the Belgians from 23 December 1909 until his death in 1934. Born in Brussels as the fifth child and second son of Prince Philippe, Count of Flanders and Princess Marie of Hohenzollern-S ...

and published on 11 July 1917 during

World War I World War I (28 July 1914 11 November 1918), often abbreviated as WWI, was one of the deadliest global conflicts in history. Belligerents included much of Europe, the Russian Empire, the United States, and the Ottoman Empire, with fightin ...

. The letter's author, the

philologist Philology () is the study of language in oral and written historical sources; it is the intersection of textual criticism, literary criticism, history, and linguistics (with especially strong ties to etymology). Philology is also defined as th ...

, set out a number of grievances relating to the treatment of the

Flemish Flemish (''Vlaams'') is a Low Franconian dialect cluster of the Dutch language. It is sometimes referred to as Flemish Dutch (), Belgian Dutch ( ), or Southern Dutch (). Flemish is native to Flanders, a historical region in northern Belgium; ...

within the

Belgian Army The Land Component ( nl, Landcomponent, french: Composante terre) is the land branch of the Belgian Armed Forces. The King of the Belgians is the commander in chief. The current chief of staff of the Land Component is Major-General Pierre Gérard. ...

fighting on the

Yser Front The Yser Front (french: Front de l'Yser, nl, Front aan de IJzer or ), sometimes termed the West Flemish Front in British writing, was a section of the Western Front during World War I held by Belgian troops from October 1914 until 1918. The front ...

during

, especially concerning the perceived inequality of

French French (french: français(e), link=no) may refer to: * Something of, from, or related to France ** French language, which originated in France, and its various dialects and accents ** French people, a nation and ethnic group identified with Franc ...

and

Dutch language Dutch ( ) is a West Germanic language spoken by about 25 million people as a first language and 5 million as a second language. It is the third most widely spoken Germanic language The Germanic languages are a branch of the Indo-Europea ...

s. It demanded that new legislation to equalise the status of the two languages be introduced after the war. The letter was the most famous action of the

Frontbeweging The ''Frontpartij'' (Dutch language, Dutch; "Front Party") was a Belgium, Belgian political party that campaigned for increasing recognition for the Flemish people and their language. Originating from the earlier ''Frontbeweging'' ("Front Movement ...

and is considered an important moment in the history of the

Flemish Movement The Flemish Movement ( nl, Vlaamse Beweging) is an umbrella term which encompasses various political groups in the Belgian region of Flanders and, less commonly, in French Flanders. Ideologically, it encompasses groups which have sought to promo ...

. The letter expressed loyalty to Albert I and demanded autonomy, rather than independence, for Flanders within a Belgian framework. It nonetheless provoked an angry reaction from the High Command which viewed the letter as subversive. Within German-occupied Belgium, a large faction of the Flemish Movement were collaborating with the German authorities as part of the ''

Flamenpolitik ''Flamenpolitik'' (German; "Flemish policy") is the name for certain policies pursued by German authorities occupying Belgium during World War I and World War II. The ultimate goal of these policies was the dissolution of Belgium into separate W ...

'' and the letter defended their actions. In the aftermath of the letter's publication, Flemish Movement ideas spread among ordinary Flemish soldiers for the first time, leading to growing unrest. Armand De Ceuninck was appointed to Minister of War in August to restore discipline.

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