The Adventures of Robin Hood (1938) -- Errol Flynn.
A Connecticut Yankee in King Arthur's Court (1949) -- Bing Crosby.
Tales of Robin Hood (1951)
Knights of the Round Table (1953)
The Seventh Seal (1957) -- Bergman.
The Sword in the Stone (1963) -- animated young Arthur with Merlin.
Becket (1964) -- the hooly blisful martyr.
Camelot (1967) -- the Broadway musical.
The Lion in Winter (1968) -- Hepburn and O'Toole as Elinor and Henry.
The Decameron (1970) -- medieval Italy.
Monty Python and the Holy Grail (1974) -- Terry Gilliam, Terry Jones, et al.
Robin and Marian (1976) -- an older Robin goes out with dignity.
Excalibur (1981) -- Arthurian.
Sword of the Valiant (1984) -- momentarily Sir Gawain and the Green Knight.
Ladyhawke (1985) -- lovers cursed.
The Name of the Rose (1986) -- Umberto Eco mystery starring Sean Connery.
Robin Hood: Prince of Thieves (1991) -- Kevin Costner.
The Fisher King (1991) -- Terry Gilliam grail story.
Robin Hood: Men in Tights (1993)
Brother Cadfael (1994) -- British tv series starring Derek Jacobi.
First Knight (1995) -- the Arthurian love triangle.
The Advocate (1996) -- medieval legal system tries animals in court.
Timeline (2003) -- time travel.
Robin Hood (2010) -- more democratic pretense.