18 May is the 138th day of the year (139th in leap years). There are 227 days remaining until the end of the year.
- 1291: Ignotus Peverell dies. His son inherits his father's Cloak of Invisibility.
- 2001 Jessica Black is Born
Behind the scenes
- 1941: Miriam Margolyes, the actress who played Pomona Sprout in the film version of Harry Potter and the Chamber of Secrets, and in the film versions of Harry Potter and the Deathly Hallows, is born.