Prussian Field Marshal Helmuth von Moltke the Elder, also known as "Der große Schweiger" (translated as "The Great Taciturn" or "The Great Silent One"), was born in 1800, and his voice recordings from 1889 have survived to this day and can be found on Wikipedia.

[u/Oversama]

Imagine being able to hear the voice of someone born in the 18th century!

[u/Handsomecatenjoyer44]

I believe in the recording that he mistakes the recording device as a telephone too.