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by ane 583 days ago
GNU Emacs is not the first Emacs, but Lucid Emacs is a fork of GNU Emacs. Lucid Emacs eventually renamed itself as XEmacs (the "X" meaning "something" because they didn't know who owns the trademark as Lucid Inc went out of business.

Here's a timeline of Emacs https://www.jwz.org/doc/emacs-timeline.html