Gustav Klimt is the best known of the Viennese artists movement of the late 18th century. I fell in love with his gorgeous paintings back in the early 1970s and have in my library two books on his art.
The first is this large hard cover...
...and this is a large format paperback.
The following book is a study of the movement.
Also within the decadent category is Aubrey Beardsley whose art was extremely popular in the 1970s.
You could also include Oscar Wilde...
Finally the great Russian designer Leon Bakst
Coming next - fantastic art.