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Eligiusz Józef Niewiadomski | |
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| Born | 1 December 1869 |
| Died | 31 January 1923 (aged 53) |
| Cause of death | Execution by firing squad |
| Resting place | Powązki Cemetery |
| Alma mater | Imperial Academy of Arts |
| Occupation | Artist |
| Criminal status | Executed |
| Conviction(s) | Murder |
| Criminal penalty | Death |
Eligiusz Józef Niewiadomski (1 December 1869 – 31 January 1923) was a Polish modernist painter and art critic who sympathized with the right-wing National Democracy movement. In 1922 he assassinated Poland's first President, Gabriel Narutowicz, in his first week in office as president.