Question

The phrase “mad, bad and dangerous to know” has become a popular way of describing dastardly rogues. But to whom was it originally used?

Answer 1

Thank you for asking the question.let me help you in finding the answer.
The phrase"mad , bad and dangerous to know" become a extremely popular today.
It was used for Lord Byron  and is used "Lady Caroline Lamb"
Since , than it has been used in  many  album like "Dead or alive" "The cross' album.
The songs in which it was used includes The song by "blue tears" from mad , bad and dangerous.
Hope this will help you.

Answer 2

The phrase “mad, bad and dangerous to know” was originally used to refer to Lord Byron who was a budding poet at that time.

This phrase was first stated by Byron’s lover Lady Caroline Lamb, as her way of assessing his personality. The statement was made after the pair met for the first time when Byron’s Childe Harold was published in 1812.