Graham Chapman was an English comedian, actor, writer, physician and one of the six members of the Monty Python comedy troupe. He was also the lead actor in their two narrative films, playing King Arthur in Monty Python and the Holy Grail and the title character in Monty Python's Life of Brian. He coauthored and starred in the film Yellowbeard.

Graham Chapman was educated at Melton Mowbray Grammar School and studied medicine at Emmanuel College, Cambridge, where he began writing comedy sketches with John Cleese, who was also a Cambridge student. Chapman qualified as a medical doctor at the Barts Hospital Medical College, but never practised medicine professionally.

While at Cambridge, Chapman joined Footlights. His fellow members included Cleese, Tim Brooke-Taylor, Bill Oddie, David Hatch, Jonathan Lynn, Humphrey Barclay, and Jo Kendall. Their revue A Clump of Plinths was so successful at the Edinburgh Fringe Festival that they renamed it Cambridge Circus, and took the revue to the West End in London and later New Zealand and Broadway in September 1964. The revue appeared in October 1964 on The Ed Sullivan Show.

Chapman and Cleese wrote professionally for the BBC during the 1960s, primarily for David Frost, but also for Marty Feldman. Chapman also contributed sketches to the BBC radio series I'm Sorry, I'll Read That Again and television programmes such as The Illustrated Weekly Hudd (starring Roy Hudd), Cilla Black, This is Petula Clark, and This is Tom Jones.

Chapman, Cleese, and Tim Brooke-Taylor then joined Feldman in the television comedy series At Last the 1948 Show. Chapman, and on occasion Cleese, also wrote for the long-running television comedy series Doctor in the House. Chapman also co-wrote several episodes with Bernard McKenna and David Sherlock.

n 1969 Chapman and Cleese joined Michael Palin, Terry Jones, Eric Idle and American artist Terry Gilliam for Monty Python's Flying Circus. Cleese and Chapman's classic Python sketches include "Raymond Luxury Yacht", and "Dead Parrot". These were largely straight roles, but in the Flying Circus, he had tended to specialise in characters closer to his own personality: outwardly calm, authoritative figures barely concealing a manic unpredictability.

In David Morgan's 1999 book Monty Python Speaks, Cleese asserted that Chapman - although officially his co-writer for many of their sketches - contributed comparatively little in the way of direct writing. Rather, the Pythons have said that his biggest contribution in the writing room was an uncanny intuition as to what was funny.

Although often small, his contributions were often the spice that gave the sketch its flavour. In the classic "Dead Parrot Sketch", written mostly by Cleese, the frustrated customer was initially trying to return a faulty toaster to a shop. Chapman would ask "How can we make this madder?", and then came up with the idea that returning a dead parrot to a pet shop might make a more interesting subject than a toaster.

Chapman died of a rare spinal cancer. It was diagnosed in November 1988 after Chapman's dentist found a growth on his tonsils. By September 1989 the cancer was declared incurable. He filmed scenes for the 20th anniversary of Monty Python that month, but was taken ill again on October 1, 1989.

Present when he died in a Maidstone Hospice on the evening of October 4, 1989 were John Cleese, Michael Palin, David Sherlock, his brother John, and John's wife, although Cleese had to be led out of the room to deal with his grief.

Terry Jones and Peter Cook had visited earlier that day. Chapman's death occurred one day before the 20th anniversary of the first broadcast of Flying Circus; Terry Jones called it “the worst case of party-pooping in all history."