This is the Great Swedish Writer, late 19th century.
A number of Swedish writers, to my mind, are considered Great largely due to a certain lack of competition, Sweden being sort of a tiny little country. (Very sorry, all fellow Swedes, but there it is.)
Strindberg, however, I believe is rightly considered Great also from a larger perspective, provided you can deal with his misogyny issues and inimical personality.
He was also a (very mediocre) painter and a photographer, which is notable since that was such a recent medium. To me, his enthusiasm for photography vouches for an open-mindedness which is not always conspicuous in his writings.