Question: from the Monty Python group who plays the role of Brian?

Context paragraphs:
Python Night – 30 Years of Monty Python: Python Night was an evening of Monty Python related programmes broadcast on BBC2 on 9 October 1999, to celebrate the 30th anniversary of the first broadcast of "Monty Python's Flying Circus".  It featured newly written sketches, three documentaries and a screening of "Monty Python's Life of Brian".

Ian MacNaughton: Edward Ian Macnaughton (30 December 1925 – 10 December 2002) was a Scottish actor-turned-television producer and director, best known for his work with the "Monty Python" team.  MacNaughton was director and producer for all but four of the forty five episodes of "Monty Python's Flying Circus" from 1969 to 1974, director of the group's first feature film "And Now for Something Completely Different" in 1971 and director of their two German episodes, "Monty Python's Fliegender Zirkus" in 1971 and 1972.  In 1973 the production team shared the BAFTA Award for Best Light Entertainment Programme for "Monty Python's Flying Circus".

Monty Python's Life of Brian: Monty Python's Life of Brian, also known as Life of Brian, is a 1979 British religious satire comedy film starring and written by the comedy group Monty Python (Graham Chapman, John Cleese, Terry Gilliam, Eric Idle, Terry Jones and Michael Palin).  It was also directed by Jones.  The film tells the story of Brian Cohen (played by Chapman), a young Jewish man who is born on the same day as, and next door to, Jesus Christ, and is subsequently mistaken for the Messiah.

Monty Python's Contractual Obligation Album: Monty Python's Contractual Obligation Album is the final studio album by Monty Python, released in 1980.  As the title suggests, the album was put together to complete a contract with Charisma Records.  Besides newly written songs and sketches, the sessions saw re-recordings of material that dated back to the 1960s pre-Python shows "I'm Sorry I'll Read That Again", "The Frost Report", "At Last The 1948 Show" and "How To Irritate People".  One track, "Bells", dates from the sessions for "Monty Python's Previous Record", while further material was adapted from Eric Idle's post-Python series "Rutland Weekend Television".  The group also reworked material written but discarded from early drafts of "Life Of Brian" as well as the initial scripts for what would eventually become "The Meaning Of Life".

I've Got Two Legs: "I've Got Two Legs" is a song by the British comedy troupe Monty Python that was composed by Terry Gilliam.  It most prominently appears in the concert film "Monty Python Live at the Hollywood Bowl", the concert LP "Monty Python Live at Drury Lane" and the album "Monty Python Sings".  It also appeared at the 2014 reunion shows in O2 Arena titled "Monty Python Live".

Archaeology Today: "Archaeology Today", recorded on 9 October 1970 and broadcast on 17 November 1970, was the 21st episode of the popular British television comedy "Monty Python's Flying Circus" which was created by the Monty Python group.  As stated on the "Monty Python's Flying Circus" Wiki, "The show often targets the idiosyncrasies of British life, especially that of professionals, and is at times politically charged"; this episode in particular seems to target the professional world of anthropology and archaeology.

The Instant Monty Python CD Collection: The Instant Monty Python CD Collection is a box set released in 1994 of six CDs containing eight albums by the Monty Python troupe.  It does not include the first Monty Python record, "Monty Python's Flying Circus", whose rights are still owned by the BBC.

Never Be Rude to an Arab: "Never Be Rude to an Arab" is a satirical song by the members of "Monty Python's Flying Circus", originally appearing on the 1980 album "Monty Python's Contractual Obligation Album".  It appears as sung by Terry Jones in the theatrically released concert film "Monty Python Live at the Hollywood Bowl" and was included on the compilation album "Monty Python Sings".

Monty Python's Flying Circus: Monty Python’s Flying Circus (known during the final series as just Monty Python) is a British sketch comedy series created by the comedy group Monty Python and broadcast by the BBC from 1969 to 1974.  The shows were composed of surreality, risqué or innuendo-laden humour, sight gags and observational sketches without punchlines.  It also featured animations by group member Terry Gilliam, often sequenced or merged with live action.  The first episode was recorded on 7 September and premiered on 5 October 1969 on BBC One, with 45 episodes airing over four series from 1969 to 1974, plus two episodes for German TV.

John Cleese: John Marwood Cleese ( ; born 27 October 1939) is an English actor, voice actor, screenwriter, producer, and comedian.  He achieved success at the Edinburgh Festival Fringe and as a scriptwriter and performer on "The Frost Report".  In the late 1960s, he co-founded Monty Python, the comedy troupe responsible for the sketch show "Monty Python's Flying Circus" and the four Monty Python films: "And Now for Something Completely Different", "Monty Python and the Holy Grail", "Life of Brian" and "The Meaning of Life".

Supporting paragraphs: John Cleese Monty Python's Life of Brian
Answer: Graham Chapman