Appending my comments to your list. I'd add some movies to it, but it's getting late....no coments means I didn't see it (or was bored to sleep by it).
EARLY MEDIEVAL (500 to 1050 AD)
The Knights of the Round Table
Sword of Lancelot - I think I finally saw this one and had a running commentary on it right here on C-C. The director should be taken out and drawn and quartered and then disemboweled (and I'm aware that "drawing" IS disemboweling - Once is not enough)! If you have any ambition to be a director, this is a great example of a listless, uninspired dirctor.
First Knight [SPRING 96] - Dreadful.
Excalibur [SPRING 96] - Idiosynchratic, to say the least. Some actors I hate, but you have to see Nicol Williamson as Merlin
Camelot - Dead bore
Prince Valiant - Robert Wagner with effeminate page boy wig - he's still trying to live down this stinker. Cursed Vikings in the public consciousness as having horned helmets (if the LEGO Vikings have horns, blame this movie).
Sword of the Valiant - Wasn't this the Gawain and the Green Knight movie? Sparkles with Sean Connery on screen, deathly dull the rest of the time (and Connery is on really briefly).
The Sword in the Stone (Disney animation) - Great book, run-of-the-mill animated film.
Monty Python and the Holy Grail (932 AD) - Python is an acquired taste. It's funnier the second or third time around.
The Green Knight
Prince of Jutland
Merlin and the Sword
Merlin of the Crystal Cave
Flight of the Dragons (animated)
The Sword and the Sorcerer (Disney) - Disney?!? Trashy B-movie Sword and Sorcerery (as if you couldn't guess by the title). Steals from all sorts of sources. But at least it has some energy.
Dragonslayer - Go-Motion animation (computer aided motion during otherwise traditional stop-motion animation)makes the Dragon the star (still the best screen dragon). But why didn't the heroine simply disqualify herself from the lottery?
Tristan et Iseuldt
The Vikings - "Yonder lies de castle o' me faddah" Yes, I know that was a different Tony Curtis movie (not on this list - something against Arabian Nights movies?).
The Littlest Viking
The Longships - Richard Widmark as a Viking? Well, maybe the wily aspect, but physically?
Eric the Viking - I have the book, haven't seen the movie
The Norseman - Probably the worst movie on this list. Lee Majors leads his band of NFL NorZemen (heavy on the Z) against Amerinds. Utterly no redeeming value.
The Black Shield of Falworth - Awful 50's movie that at least has naivite and enthusiasm going for it.
The Black Arrow - I dimly remember this one - longbowman goes far east. Fairly boring
Alfred the Great (late 800s England) - this was buried late one night so I was only half awake watching it. Michael York as the head Viking and David Hemmings as Alfred. Interesting period, but I don't really remember much about (which probably sums it up)
MIDDLE AGES (1050 to 1450 AD)
MacBeth (set mid-1000s Scotland) - In the poisoned entrails throw,,,Something wicked this way comes, t'is MacBeth.
Hearts and Armor (mid-1000s Spain)
El Cid (late-1000s Spain) - Uninspired Big Budget Heston vehicle.
The Crusades (documentary) - Documentary? What about Cecil B DeMille's trashing of history in his 1935 film The Crusades? Epic battle scenes but pure nonsense story.
The Seventh Seal (set during the Crusades)
Ivanhoe (late 1100s)
1) w/Robert Taylor
2) w/Anthony Andrews & Olivia Hussey
Former is the usual 50's costume melodrama that I have a soft spot for - the latter is truer to the book but a dead bore.
Robin Hood (900-1000 England)
1) w/Errol Flynn - Golden
2) w/Patrick Bergin) - Uma Thurman as Marion? This was supposed to come out on the big screen but didn't want to compete with Costner's Men Without Tights. A darker and grittier Robin Hood tale.
3) w/Michael Praed/Jason Connery
4) Disney (animated) [SPRING 96]) - Wait, is this the God Awful Barnyard critters with American Southern accents version?
Robin Hood, Prince of Thieves - Men Without Tights. Politically Correct version with non-charismatic Robin Hood (Costner). Some nice action scenes and Alan Rickman truly chewing up the scenery (better over the top than Costner's listless performance).
Robin and Marion - Disillusioned Middle-aged Robin revisionist tale. Good cast - Sean Connery, Nicol Williamson, Robert Shaw. Richard Lester director (Three & Four Musketeers).
Robin Hood: Men in Tights [FALL 95] - Has a few moments (title song), but Mel Brooks was past his peak as a writer/director.
Men of Sherwood Forest
The Court Jester (12th C England) - The flagon with the dragon has the pellet with the posion, the vessel with the pestle has the brew that is true. One of Danny Kaye's better outings.
The Flame and the Arrow
The Lion in Winter (about Henry II, ruler of England 1154-1189) - Boring medieval political drama
Beckett (archbishop of Canterbury during reign of Henry II) - no wait, I'm thinking of A Man for All Seasons.
Brother Sun, Sister Moon (St Francis of Assisi, 1182-1226) religious - interesting tale of St. Francis.
The Conqueror (about Genghis Khan, early 1200s Asia) - The movie that (eventually) killed John Wayne (radition poisoning from atomic tests - along with a large number of the cast and crew). Shows what a truly dreadful actor Wayne was - just a laughably bad preformance.
Alexander Nevesky (mid-1200s Russia) - Classic, if somewhat a creature of the political times.
The Dragon and the Sword (Russian)
The Magic Sword (13thC) - Gary Lockwood stars? Really bad effects. I mean dreadful, laughably bad.
Braveheart (1300 Scotland) [SPRING 96] - Don't take the historical accuracy as Gospel, but spectacular.
The Black Rose (time of Kublai Khan, late 1200s)
Edward II (early 14th C)
The Name of the Rose (set in 1312 monastery) [SPRING 94] - I'm a sucker for Sean Connery films. Whodunnit meets the Middle Ages with religious persecutions. I rather like this one (rather steamy sequence that has made it on my basic satellite uncut).
Decameron Nights (about Italian poet Boccaccio, mid-1300s)
Hamlet (set 1300/1400?)
1) w/Mel Gibson - Stick to action, Mel.
2) w/Laurence Olivier - My brother's name is Laurence, guess why.
Rosenkrantz and Guildenstern Are Dead (Hamlet comedy) [FALL 93]
Richard II (late 1300s England)
Richard III (late 1400s England) - as you may be able to tell by my lack of comments, I find most of Shakespeare's historical plays boring. I feel asleep to a large number of them when I was young and my mother controlled the TV.
The Hunchback of Notre Dame (1400's France) - Sanctuary! Charles Laughton in a part made for him (sorry, Charles).
A Walk with Love and Death (1400s Italy)
Joan of Arc: A Portrait of a Legend (1428 France)
Henry V (early 1400s England)
1) w/Kenneth Branagh, [SPRING 95]
2) w/Laurence Olivier
I still haven't made it all the way through either of these, and my mother was a Shakespeare fan (see naming of my brother above).
The Warlord - Chucky Heston as a lusting Norman in a small keep.
Ladyhawke (based on 12C French legend) [FALL 95] - Matthew Broderick should never have gotten work again. The movie never quite clicks.
The Sorceress (13-14C France)
The Princess Bride - wonderful comedic fantasy that was unappreciated at the time.
The Messenger: The story of Joan of Arc - Which was this one: there were two from the same year. I think this was the doubting thomas version. Blarg.
Jabberwocky (Monty Python) - This had some Python members, but was not Monty Python. The only real belly laugh in the entire movie is ruined by a pool of blood, which sums up the movie's brutal sense of alleged humor. But it did have a great Jabberwock true to Tenniel's Alice illustration. I think that was David Prowse (Darth Vader) once again faceless as the fully armored (jousting armor) knight.
Stealing Heaven (about Abelard & Heloise, early 1100s France)
Black Adder I (British comedy) - Where the wit is more lethal than the weapons.
The Navigator (from 11/12C Cumbria to 20C New Zealand
Snow White (Disney) - That voice! Ahhhh, not that voice! I always thought the Evil Stepmother was the babe. The first full-length animated film - an absolute breakthrough, but see the advance in the skills of the animators in Pinnochio and Fantasia.
Sleeping Beauty (Disney) - odd, angular style in an attempt to have a medieval look. The first half of the movie is a dead bore, but the second half comes to life with and has a great final transformation into the 2nd best screen dragon (and inspiration for the best).
Willow - uneven fantasy with (dang, I forget - he's in the Potter films)...Warwick Davis in the title role.