Who was known as "The Once and Future King"?

I knew the answer . I didn’t know Disney got his film title from Mallory, along with Elton John for his song

Player #25874027, I used to work for Disney the concepts Are still the Same

Cookie Bean, There are different versions of that song one for Diana and one for Marilyn Monroe

I knew the answer, thanks to Merlin. I love that series.😊