Roger William Allam (born 26 October 1953) is a British actor, who has performed on stage, in film, on television and radio.
He played Inspector Javert in the original London production of the stage musical Les Misérables, First Officer Douglas Richardson in the award-winning radio series Cabin Pressure, and DCI Fred Thursday in the TV series Endeavour. He is also known for his roles as Illyrio Mopatis in the HBO series Game of Thrones, Royalton in Speed Racer, Lewis Prothero in the 2005 adaptation of V for Vendetta and as Peter Mannion MP in The Thick Of It.
He has been nominated six times for a Laurence Olivier Award, and has won three times.

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