Monty Python and the Holy Grail (1975) IMDb
Terry Gilliam (director).
Arthur, king of the Britons, tries to scrape up a Round Table who can help him quest for the Holy Grail. They’re foiled at every turn by mud and the French.
Parody of Arthurian legendry and medieval times in general. Directed by the two Terrys. Watch Excalibur (1981) for contrast.