1897 - first Dos Equis beer is brewed

"If a tree falls in the forest, and no one hears it, does it still make a sound?"

It does and doesn't make a sound at the same time. The philosophers need to hear some quantum reasoning.

Best-known appearance in a book?

If it was Cheshire Cat, the answer is yes. If it was Simba, who was technically first introduced in the script for a movie, not in the movie itself, the answer is no.

Sorry if this is too subjective.

1886 – An American mastermind mixes cocaine with caffeine to make Coca-Cola.*

* Not entirely accurate.

First introduced in a book?

Fictional character?

Native speaker of Romance language?

Born in United States or Europe?

1876: novel about that year's U.S. presidential election

1872: Yellowstone becomes the US's first national park

I think you disabled all like info.

Born in the United States or Europe?

Living or died in the 21st century?

If no, non-free guess: Stephen.

If no to that, Spartaculous can come in a few hours and guess it correctly.

Born in what is now Norway, Sweden, or Denmark?

If no to DreamTrawler's question, free guess: Canute.

Scratch, he was a pagan.

If yes to DreamTrawler's question:

Free guess: Árpád, king of Hungary.

Aw, you beat me to it!

Monarch?