<P> Bill Haydon is a fictional character created by John le Carré in le Carré's Tinker Tailor Soldier Spy . </P> <P> Haydon was born around 1917; no specific year is given but he is known to have been an undergraduate at Oxford University in 1937 . He comes from an aristocratic family with connections throughout British high society . A polymath of sorts with a brilliant and charming personality, he excels as a student, takes up remote languages with ease, and proves a gifted painter while at Oxford . He is identified for recruitment in the Circus (John le Carré's lightly fictionalised version of MI6 / SIS) by his tutor and acts in turn as a talent - spotter among his classmates, most notably Jim Prideaux, who also becomes his lover . In World War II, Haydon builds a superb record in Nazi - occupied Europe and the Middle East, such that he elicits comparisons with Lawrence of Arabia . Unbeknownst to the British, Haydon is also recruited as a Soviet agent around that time by Karla, Moscow Centre's crafty and legendary spymaster . </P> <P> After the war, Haydon holds positions of increasing importance in the Circus, becomes its premier expert on the Soviet Union, and eventually rises to the senior staff of Control, the unnamed Chief of the Circus . In the early years of the Cold War, he limits his espionage activities to' selected gifts of intelligence' that advance the Soviet cause over the American one without harming British interests . The Suez crisis of 1956 convinces him that Britain has lost all influence as a world power and leads him to become a' full - fledged Soviet mole with no holds barred .' In 1961, he formally receives Soviet citizenship, then achieves the rank of Soviet intelligence colonel and is awarded further Soviet decorations over the next ten years . </P> <P> Control has come to suspect that there is a mole deep in the organization . By 1972, alone in this belief, he has ruled out all but his five senior lieutenants: Percy Alleline, Roy Bland, George Smiley, Toby Esterhase, and Haydon . To save his agent, Karla engineers the demise of Control and Smiley whom he reckons to be the most likely to unmask Haydon . Karla is aware of Smiley's one personal weakness--his unreciprocated love for his wife Ann, who is a habitual adulterer--and orders Haydon to have an affair with her to cloud Smiley's judgment further . As Control is about to discover the truth, Karla lures him into ordering a doomed operation in Czechoslovakia to learn the identity of the mole from a (fake) Czech defector . Control picks Jim Prideaux for the operation and Haydon chooses to sacrifice his close friend to save himself . Prideaux is captured and reveals under duress the full extent of Control's knowledge of the mole to Karla before being repatriated to Britain and discharged from the Circus . Control is dismissed and dies soon afterwards, Smiley is forced into retirement, and Alleline becomes Chief . Haydon assumes control of London Station, in control of all foreign operations, effectively giving him unfettered access to intelligence worldwide . </P>

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