How many different characters does Michael Palin play in 'Monty Pyton and the Holy Grail'?

Explanation

'Monty Python and the Holy Grail' (1975) is a musical comedy by Monty Python. The story is about King Arthur and his knights on a low-budget search for the Holy Grail. This leads to many adventures. Monty Python consists of Graham Chapman, John Cleese, Terry Gilliam, Eric Idle, Terry Jones and Michael Palin. Michael Palin plays no less than 12 characters in this film.