It was almost certainly spoken around a fire in a cave and has been lost to time before humans really recorded history
Cave fire speech is not a medium in the strict sense, though.
That means at least writing would have to have been available.
Gilgamesh epic might be a good candidate, I think.deleted by creator
Not a real monologue, but Humbaba mocks Gilgamesh and Enkidu for their hubris and lack of wisdom. He specifically attacks Enkidu, questioning his origins and his betrayal of the wild. He vows to slaughter them both and feed their flesh to the birds and beasts of the forest.
The oldest in English that we have access to might be in Beowulf? Villain monologues are as old as stories, and stories are as old as humanity.
Cave drawings?
Richard III starts with a villain monolog.
Oh dear Richard the 3rd
Judging from prose like Mobi Dick, it was written at about the same time, covered 10+ pages, had 342 commas and semicolons, and was a single epic run-on sentence.
I would check the bible, it’s full with that kind of stuff.
Isn’t there several in the old testament?
