# Who discovered Napier's number?

Who discovered Napier's number?

I read Bernoulli calculated it, Napier discovered it but it is e because of Euler.

I know how Bernoulli calculated it but where did Napier see it?

• Napier did not "see" it, he (or rather his translator Oughtred) calculated some logarithms to base $e$ without needing the base itself. Several other people calculated related numbers before Bernoulli, but none of them isolated $e$, see MacTutor's history of $e$. – Conifold May 1 at 6:22
• Napier used an approximate value. See hsm.stackexchange.com/questions/42/… – Alexandre Eremenko May 2 at 1:35