Olde and Forgotten Bewitchments and Charmes is a book of spells from earlier times.
One of the books that Harry, Ron, and Hermione examined while preparing for the second task (GF26). It's unclear if the book itself is old or if it simply discusses ancient magic. However, the archaic spellings in the title suggest that it's actually quite old itself -- or the author is being pretentious.
Tags: library books