Portal:Germany/Anniversaries/January/January 23
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![David Hilbert](http://upload.wikimedia.org/wikipedia/commons/thumb/7/79/Hilbert.jpg/100px-Hilbert.jpg)
- 1793 – Prussia and Russia sign a treaty confirming the Second Partition of Poland
- 1840 – Birth of scientist and entrepreneur Ernst Abbe
- 1843 – Death of writer Friedrich de la Motte Fouqué
- 1862 – Birth of mathematician David Hilbert