solemn Council forthwith to be held at Pandemonium the high Capital of Satan and his Peers
The first use of the word Pandemonium was in 1667 in John Milton's "Paradise Lost." It is the name Milton gave to the capital of Hell that Satan and his fellow demons, vanquished from heaven, established as their base of operations.
The book itself is about the fall of man and seeks to justify the ways of God to men. Hieronymus Bosch "Garden of Earthly Delights" (1500) is perhaps the best illustration to that, and matches the book written by Milton.