Minifigures - Series 20 The Knight Is the knight in the new Minifigures Series 20 based on the character in the movie Monty Python and The Holy Grail?

Here's what it looks like:
This seems to match my recollection of the major knights from the film, so pretty much probably not:


There wasn't a black (sable) and yellow (or) quartered knight, nor a martlet or raven on his shield.

That helmet element (Mini Knight's Helmet Closed) has been around since 2010, and has often been used in tournament and jousting sets, as well as general Castle sets of the time.