100% verified The same day, three eras.

23 September

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Contemporary era

1889

Nintendo founded

On 23 September 1889, Fusajiro Yamauchi founded Nintendo, at first a maker of playing cards.

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Contemporary era

1846

Discovery of Neptune

On 23 September 1846, the planet Neptune was first observed, matching Le Verrier's calculations.

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From the Middle Ages to the Enlightenment

1122

Concordat of Worms

On 23 September 1122, the Concordat of Worms ended the Investiture Controversy.

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