@ramin_hal9001 Oh the story is much more interesting. James Gosling wrote Emacs for Unix. Richard Stallman stole his implementation, and just changed the copyright notices on the files, and that became GNU Emacs.
Check out Gosling’s recounting of the story here, including why he let him get away with it: https://www.youtube.com/watch?v=TJ6XHroNewc&t=9896s
BTW, if you look into the sources of that github repo, the .ml files are elisp. Those little summaries that GH gives you of what languages are used, aren’t especially accurage.