I think the winner has to be the recent Robin Hood with Russell Crowe.
Manages to get King Richard killed off in France without ever being captured and held for ransom, which was just the biggest and most important event in English history for decades. Dang near bankrupted the country.
Also has the French launching an invasion of England that never occurred.
Not to mention the obligatory PC Maid Marion charging into combat in full armor.
Although I really like the ending where instead of staying up on the cliffs and shooting the French full of arrows without risk the themselves, they went down in the beach and fought them hand to hand. Even medieval knights weren’t that stupid.
Sorry, you have this one wrong. This much at least was lifted from history. Just as in the movie, with the aid of renegade English nobles the French landed in Dover in 1216. The failing of the movie is that English are successful on the beach. In reality the French stayed for some time, moving about the countryside and laying siege to English castles. King John's timely departure from the mortal coil later that year is what actually ended it all.