And RMS makes no secret of that: https://www.gnu.org/gnu/rms-lisp.html so I probably learned this before at some point.
No, the first Emacs in Lisp was the one from Dan Weinreb for the Lisp Machine, which was also the second Emacs implementation. It was called EINE, EINE Is Not Emacs. Then ZWEI, ZWEI Was EINE Initially.
Check out the gorgeous Creative Computing ad:
And contrast with the ugly UniPress Emacs ad:
If you edit please try Emacs.
PROGRAMMER GENERAL'S WARNING: Inferior
Editors Cause Decreased Productivity Or
Vaporware And May Complicate Development.
UniPress Emacs: Less than 90MB "tar"(1).
And CLIMAX is Common Lisp Interface Manager emACS:
Of course JOVE is Jonathan's Own Version of Emacs:
Sadly ZILE is Lossy Emacs:
Worse yet, VILE is VI Like Emacs:
He's spread his knowledge of music theory with many, including me, on the (opensource) musescore website.