Which Monty Python member played King Arthur in 'Monty Python and the Holy Grail'?

Graham Chapman played King Arthur in Monty Python and the Holy Grail. His Arthur is the supposedly noble King of the Britons who travels across medieval Britain searching for knights and eventually begins a quest for the Holy Grail.

The 1975 film parodies Arthurian legends while combining an original quest narrative with the Pythons' surreal interruptions and historical absurdity. Chapman also plays several smaller parts, including the middle head of the Three-Headed Giant and the voice of God. His performance gives Arthur authority and dignity even when the king is arguing about coconuts, confronting anarcho-syndicalist peasants, or being taunted by French soldiers.

The other options are also members of Monty Python, which makes the question deliberately tricky. Michael Palin played Sir Galahad, Eric Idle played Sir Robin, and John Cleese played Sir Lancelot. Terry Gilliam and Terry Jones directed the film together.