Eliezer Ben-Yehuda, born Eliezer Yitzhak Perelman, ("reviver" of Hebrew) in Luzhky, Lithuania, 1858.

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Eliezer Ben-Yehuda, born Eliezer Yitzhak Perelman, ("reviver" of Hebrew) in Luzhky, Lithuania, 1858.
Martin Schleyer, creator of Volapük, was born in 1831.
On this day in 1831 Martin Schleyer, a German Catholic priest who invented the constructed language Volapük, was born. His official name was "Martin Schleyer"; he added the name "Johann" (in honor of his godfather) unofficially.
Schleyer felt that God had told him in a dream to create an international language. Volapük would go on to become one of the most successful auxiliary languages with nearly a million adherents. However it was largely displaced in the late 19th and early 20th centuries by Esperanto.
Dr. James Cooke Brown, creator of Loglan, born on this day in 1921
On this day Dr. James Cooke Brown was born in 1921. He was an American sociologist and science fiction author. He is notable for creating the artificial language Loglan and for designing the Parker Brothers board game Careers.
Loglan is the first among, and the main inspiration for, the languages known as logical languages (loglangs), which also includes Lojban.
Construction Kit by Mark Rosenfelder is published in 2010
On this day a print version of the well-known Language Construction Kit by Mark Rosenfelder (aka The Zompist) is published in 2010.
A great resource for the beginning conlanger alongside:
The Art of Language Invention by David J. Peterson
How to Create a Language by Pablo David Flores
Essays on Language Design by Rick Morneau
The Conlang Manifesto by David J. Peterson
Glossary of Terms by Donald Boozer
More References by Donald Boozer
For more check our list of resources on our site and our Conlanger’s Library.
Ro enters the U.S. Congressional Record, 1914
On this day a mention of Edward Powell Foster's Ro is entered into the U.S. Congressional Record (H. Res. 432) in 1914.
From 1906 to 1931 from his hometown in Marietta, Edward Powell Foster published several books, a dictionary, and a newsletter using his language which he named Ro meaning “tell, say” in the language itself. Foster designed Ro to convey the meanings of words by their form.
A number of supporters are listed in his books including Melvil Dewey, creator of the Dewey Decimal System.
On March 2, 1914, Rep. George White of Ohio even introduced H. Res. 432 to the Committee on Education of the U.S. House of Representatives providing for an investigation of a new language known as Ro, securing a mention in the Congressional Record for Foster's language.
Check out more: https://conlang.org/resources/conlangers-calendar/
On this day: The word "conlang" is added to www.etymonline.com, 2014
Also:
James Evans, missionary who created syllabaries for various Algonquin languages, born, 1801.
James Evans (January 18, 1801 - November 23, 1846) was a Canadian Methodist missionary and amateur linguist. He is best remembered for his creation of the "syllabic" writing system for Ojibwe and Cree, which was later adapted to other languages such as Inuktitut.
https://conlang.org/conlangers-calendar/
A Conlanger’s Calendar | Language Creation Society
Pres. John Quincy Adams responds to James Ruggles in a letter dated this date, 1827
Ruggles is arguably the first person to develop a language which mixed the categorizing of knowledge typified by Wilkins and the streamlining of language epitomized by Esperanto. Johann Schleyer's Volapük, which most see as the first language of this type, would not appear until 1880. The Ohioan Ruggles beat Schleyer by over fifty years! However, Volapük would gain much wider notice than the Universal Language, and Ruggles would become one of the more obscure figures in conlanging.
You can read the letter and more about the language here: http://bit.ly/8Z1n9K
Unua Libro, the first publication to describe Esperanto, published on this day in Russian in 1887
First published on July 26 1887, Unua Libro is the first book in which Zamenhof introduced and described the constructed language Esperanto, then-called the international language, and its publication marks the formal beginning of the Esperanto movement.
Zamenhof reproduced a significant portion of the content of Unua Libro in Fundamento de Esperanto in 1905, which he established as the only obligatory authority over Esperanto in the Declaration of Boulogne, ratified by the first World Esperanto Congress later that year. However, in 1888, he established a minor change to the language, rendering the Esperanto of Unua Libro slightly outdated.