The Adventures of Baron Munchausen is a 1988 fantasy adventure film co-written and directed by Terry Gilliam, starring John Neville, Eric Idle, Sarah Polley, Oliver Reed, Uma Thurman, Jonathan Pryce and Valentina Cortese.
An international co-production of the United Kingdom, the United States and Germany, the film is based on the tall tales of the 18th-century German nobleman, Baron Munchausen, and his wartime exploits against the Ottoman Empire.
https://en.wikipedia.org/wiki/The_Adventures_of_Baron_Munchausen
She’s not a top level celebrity but I’d say she is known, especially in Canada. And someone can be important without being well known. According to Wikipedia, she has retired from acting but is still writing and directing films.