What is the French Belle Dame sans in English?

"Belle Dame sans Merci" is a French phrase that translates directly to "Beautiful Lady Without Mercy." It is often used as the title of a poem by John Keats.

However, in English, the phrase is typically referred to as "La Belle Dame Sans Merci", keeping the French article "La". It is usually understood and used in English as a literary reference to Keats' poem.