William Blake
https://en.wikipedia.org/wiki/William_Blake#/media/File:William_Blake_by_Thomas_Phillips.jpg
William Blake was an English man of many talents. He was a poet, engraver, artist, and visionary who has influenced a number of writers and artists throughout history. In the early 21st century, Blake was deemed as the earliest and most original Romantic Poet and thinker. Throughout his life, however, he was often misunderstood and dismissed as mad.
https://en.wikipedia.org/wiki/William_Blake#/media/File:William_Blake_-_Sconfitta_-_Frontispiece_to_The_Song_of_Los.jpg
The most significant influence on his work was the bible, as many of his pieces are influenced by an intense spirituality.
This illustration is described in Chapter 7 of the Book of Daniel
https://en.wikipedia.org/wiki/William_Blake#/media/File:Europe_a_Prophecy,_copy_D,_object_1_(Bentley_1,_Erdman_i,_Keynes_i)_British_Museum.jpg
_British_Museum.jpg){kind=link}
https://en.wikipedia.org/wiki/William_Blake#/media/File:William_Blake_003.jpg
When he was young he began experiencing visions, which he would either visualise through art or explain through his writings.
(one of his visions)
http://www.thehypertexts.com/William%20Blake%20Angels.htm
He was not recognized during his time, however, he had an everlasting legacy. I believe his artwork is really quite beautiful. His imagery is very powerful and I can see how much he was influenced by his visions of spirituality.
Taken from: https://www.biography.com/writer/william-blake and https://www.britannica.com/biography/William-Blake/Last-years