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It is literally the first Peano axiom that 0 is a natural number. In fact it is the only natural number that is defined in and of itself. All other natural numbers are defined by using the “successor” operation to add things to zero.

https://en.wikipedia.org/wiki/Peano_axioms

Are you a time traveler from the 5th century?

353 BCE

You know, in BC/AD (or BCE/CE), there is no year zero, so in that one case zero is sort of undefined ;)

https://en.wikipedia.org/wiki/Year_zero

If that is true, why does no one agree with you?

the what?

That's a thing some people used to believe, I guess some of them still do.