No. The Black Knight in Monty Python is a fictional character created for comedic purposes within the Monty Python universe. It's part of their absurd and humorous take on medieval tales and adventures.
Well, even though not based on a true story, the Black Knight is very important in Monty Python. It showcases the group's unique humor style. His character is a source of continuous laughter as he keeps fighting despite losing body parts. It also serves as a commentary on the idea of heroism and pride. In a traditional sense, a hero might retreat when severely injured, but the Black Knight's refusal to do so in such a comical way makes us question and laugh at our concepts of heroism and bravado.
The story behind Monty Python's Amontillado Sketch is a creative and humorous reimagining. It plays with the elements of the original tale, infusing it with Monty Python's signature style of comedy and randomness. The sketch might have taken inspiration from the dark and mysterious atmosphere of Poe's work and transformed it into something lighthearted and comical.
One of the top stories is the search for the Holy Grail itself. The knights go on various comical adventures in their quest, like facing the Killer Rabbit of Caerbannog.
It's not a completely accurate portrayal of a single true story. Rather, it takes inspiration from various real-life scenarios and weaves them into a fictional narrative.