#OTD in 1886.
The "Symbolist Manifesto" is placed in the French newspaper Le Figaro by a Greek-born poet Jean Moréas, who calls Symbolism hostile to "plain meanings, declamations, false sentimentality and matter-of-fact description," and intended to "clothe the Ideal in a perceptible form" whose "goal was not in itself, but whose sole purpose was to express the Ideal."
https://en.wikipedia.org/wiki/Symbolist_Manifesto
Symbolism at PG:
https://www.gutenberg.org/ebooks/search/?query=Symbolism&submit_search=Search