Dashed left edge = started before April 1839 ·
Dashed right edge = ongoing beyond April 1839
Events in April 1839 3
1839First Treaty of LondonPartition & autonomyThe First Treaty of London cedes the French-speaking western half of Luxembourg to Belgium; the remaining German-speaking territory takes the shape of the modern country and gains greater autonomy.
1839Treaty of LondonIndependence & neutrality recognisedThe Treaty of London formally recognises Belgian independence and guarantees its neutrality — the "scrap of paper" Germany would violate in 1914.
1839Treaty of London guarantees Belgian neutralityGreat powers settle the Belgian-Dutch separationBritain, France, Austria, Prussia, and Russia signed the Treaty of London recognizing Belgium as an independent and perpetually neutral state, while the Netherlands retained part of Luxembourg. The treaty settled the territorial disputes left over from the 1830 Belgian Revolution. Germany's violation of this guaranteed neutrality in 1914 helped draw Britain into the First World War.