Hieronymus Bosch
Hieronymus Bosch was a painter from the Netherlands who lived from 1450-1516. He was known as “art’s first visionary genius”. Little was discovered about him, however, we do know that he was an independent master of painting compositions that no human had seen before. He often painted religious themed landscapes filled with many interesting subjects and symbolic elements. He depicted mankind and the consequences of sinning in his work by illustrating unsettling pictures of hell and demons. No person had ever seen this visual representation between heaven and hell in the way that Bosch depicted it. The 3 paintings below are some of his major works that are all triptychs representing similar ideas with heaven on the left wing and hell on the right.
https://en.wikipedia.org/wiki/The_Garden_of_Earthly_Delights
https://en.wikipedia.org/wiki/The_Last_Judgment_(Bosch_triptych)
https://commons.wikimedia.org/wiki/File:The_Hay_Wain_by_Hieronymus_Bosch.jpg
His works often consist of exquisite detail and striking compositions. His paintings seem incredibly surreal as for his attention to detail. He was, in fact, considered to be the first modern surrealist due to his bizarre depictions of reality.
https://fineartamerica.com/featured/tondals-vision-hieronymus-bosch.html?product=poster
Bosch experienced some success during his life, however, he made a larger impact after his death. King Philip II of Spain started collecting his work and became a loyal fan. The paintings reminded him to stay on a righteous path.
https://www.europeanceo.com/lifestyle/hieronymus-bosch-the-mysterious-master-of-the-surreal/
Taken from: https://www.biography.com/artist/hieronymus-bosch, https://www.theartstory.org/artist/bosch-hieronymus/, and The Story of Art by E.H. Gombrich