Portal:Belgium/Anniversaries/August/August 4
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- 1113: death of Gertrude of Saxony, wife of Robert I, Count of Flanders, mother of Robert II and mother-in-law of Philip I of France
- 1900: death of Etienne Lenoir, inventor
- 1906: birth of Marie-José of Belgium, last Queen of Italy
- 1906: death of Joseph Tilly, mathematician, inventor of non-Euclidean mechanics
- 1914 - World War I: Germany invaded Belgium, thus violating Belgian neutrality; in response, the United Kingdom declares war on Germany