Next time someone complains about singular "they" I'll point them to this 17th century rant against singular "you"
(Basically my only tweet that ever "did numbers". Screenshot here for posterity.)
The best thing about this tweet is it always gets me lots of new non-binary moots. I hope they appreciate my content, which is almost strictly cats and baduk.

@kacey

Source: The History of Thomas Elwood, written by Himself, London, 1885, pp. 32-34, https://www.gutenberg.org/ebooks/6925

Discovered from cite in "The Varieties of Religious Experience," by William James, 1902.

https://en.wikisource.org/wiki/Page:The_varieties_of_religious_experience,_a_study_in_human_nature.djvu/310

The History of Thomas Ellwood Written By Himself by Thomas Ellwood

Free kindle book and epub digitized and proofread by volunteers.

Project Gutenberg
@mwl Thank you for sourcing this! I was about to ask if it was George Fox or someone else among the valiant sixty.

@arkiuat @mwl Fox (et al.) wrote an entire book on the subject! (Text available online at the link. The title is far too long to be contained in a toot.)

https://quod.lib.umich.edu/e/eebo/A40123.0001.001

A battle-door for teachers & professors to learn singular & plural you to many, and thou to one, singular one, thou, plural many, you : wherein is shewed ... how several nations and people have made a distinction between singular and plural, and first, in the former part of this book, called The English battle-door, may be seen how several people have spoken singular and plural...: also in this book is set forth examples of the singular and plural about thou, and you, in several languages, divided into distinct Battle-Doors, or formes, or examples; English Latine, Italian, Greek, Hebrew, Chaldee, Syriack, Arabick ... and how emperors and others have used the singular word to one, and how the word you came first from the Pope, likewise some examples, in the Polonian, Lithuanian, Irish and East-Indian, together with ... Swedish, Turkish ... tongues : in the latter part of this book are contained severall bad unsavory words, gathered forth of certain school-books, which have been taught boyes in Enland ... / George Fox, John Stubs, Benjamin Farley.